2003-10-21 Arnaud Charlet <charlet@act-europe.fr>

	* 3psoccon.ads, 3veacodu.adb, 3vexpect.adb, 3vsoccon.ads,
	3vsocthi.adb, 3vsocthi.ads, 3vtrasym.adb, 3zsoccon.ads,
	3zsocthi.adb, 3zsocthi.ads, 50system.ads, 51system.ads,
	55system.ads, 56osinte.adb, 56osinte.ads, 56taprop.adb,
	56taspri.ads, 56tpopsp.adb, 57system.ads, 58system.ads,
	59system.ads, 5aml-tgt.adb, 5bml-tgt.adb, 5csystem.ads,
	5dsystem.ads, 5fosinte.adb, 5gml-tgt.adb, 5hml-tgt.adb,
	5isystem.ads, 5lparame.adb, 5msystem.ads, 5psystem.ads,
	5sml-tgt.adb, 5sosprim.adb, 5stpopsp.adb, 5tsystem.ads,
	5usystem.ads, 5vml-tgt.adb, 5vsymbol.adb, 5vtraent.adb,
	5vtraent.ads, 5wml-tgt.adb, 5xparame.ads, 5xsystem.ads,
	5xvxwork.ads, 5yparame.ads, 5ytiitho.adb, 5zinit.adb,
	5zml-tgt.adb, 5zparame.ads, 5ztaspri.ads, 5ztfsetr.adb,
	5zthrini.adb, 5ztiitho.adb, 5ztpopsp.adb, 7stfsetr.adb,
	7straces.adb, 7strafor.adb, 7strafor.ads, 7stratas.adb,
	a-excach.adb, a-exexda.adb, a-exexpr.adb, a-exextr.adb,
	a-exstat.adb, a-strsup.adb, a-strsup.ads, a-stwisu.adb,
	a-stwisu.ads, bld.adb, bld.ads, bld-io.adb,
	bld-io.ads, clean.adb, clean.ads, ctrl_c.c,
	erroutc.adb, erroutc.ads, errutil.adb, errutil.ads,
	err_vars.ads, final.c, g-arrspl.adb, g-arrspl.ads,
	g-boubuf.adb, g-boubuf.ads, g-boumai.ads, g-bubsor.adb,
	g-bubsor.ads, g-comver.adb, g-comver.ads, g-ctrl_c.ads,
	g-dynhta.adb, g-dynhta.ads, g-eacodu.adb, g-excact.adb,
	g-excact.ads, g-heasor.adb, g-heasor.ads, g-memdum.adb,
	g-memdum.ads, gnatclean.adb, gnatsym.adb, g-pehage.adb,
	g-pehage.ads, g-perhas.ads, gpr2make.adb, gpr2make.ads,
	gprcmd.adb, gprep.adb, gprep.ads, g-semaph.adb,
	g-semaph.ads, g-string.adb, g-string.ads, g-strspl.ads,
	g-wistsp.ads, i-vthrea.adb, i-vthrea.ads, i-vxwoio.adb,
	i-vxwoio.ads, Makefile.generic, Makefile.prolog, Makefile.rtl,
	prep.adb, prep.ads, prepcomp.adb, prepcomp.ads,
	prj-err.adb, prj-err.ads, s-boarop.ads, s-carsi8.adb,
	s-carsi8.ads, s-carun8.adb, s-carun8.ads, s-casi16.adb,
	s-casi16.ads, s-casi32.adb, s-casi32.ads, s-casi64.adb,
	s-casi64.ads, s-casuti.adb, s-casuti.ads, s-caun16.adb,
	s-caun16.ads, s-caun32.adb, s-caun32.ads, s-caun64.adb,
	s-caun64.ads, scng.adb, scng.ads, s-exnint.adb,
	s-exnllf.adb, s-exnlli.adb, s-expint.adb, s-explli.adb,
	s-geveop.adb, s-geveop.ads, s-hibaen.ads, s-htable.adb,
	s-htable.ads, sinput-c.adb, sinput-c.ads, s-memcop.ads,
	socket.c, s-purexc.ads, s-scaval.adb, s-stopoo.adb,
	s-strcom.adb, s-strcom.ads, s-strxdr.adb, s-rident.ads,
	s-thread.adb, s-thread.ads, s-tpae65.adb, s-tpae65.ads,
	s-tporft.adb, s-traent.adb, s-traent.ads, styleg.adb,
	styleg.ads, styleg-c.adb, styleg-c.ads, s-veboop.adb,
	s-veboop.ads, s-vector.ads, symbols.adb, symbols.ads,
	tb-alvms.c, tb-alvxw.c, tempdir.adb, tempdir.ads,
	vms_conv.ads, vms_conv.adb, vms_data.ads,
	vxaddr2line.adb: Files added. Merge with ACT tree.

	* 4dintnam.ads, 4mintnam.ads, 4uintnam.ads, 52system.ads,
	5dosinte.ads, 5etpopse.adb, 5mosinte.ads, 5qosinte.adb,
	5qosinte.ads, 5qstache.adb, 5qtaprop.adb, 5qtaspri.ads,
	5stpopse.adb, 5uintman.adb, 5uosinte.ads, adafinal.c,
	g-enblsp.adb, io-aux.c, scn-nlit.adb, scn-slit.adb,
	s-exnflt.ads, s-exngen.adb, s-exngen.ads, s-exnlfl.ads,
	s-exnlin.ads, s-exnsfl.ads, s-exnsin.ads, s-exnssi.ads,
	s-expflt.ads, s-expgen.adb, s-expgen.ads, s-explfl.ads,
	s-explin.ads, s-expllf.ads, s-expsfl.ads, s-expsin.ads,
	s-expssi.ads, style.adb: Files removed. Merge with ACT tree.

	* 1ic.ads, 31soccon.ads, 31soliop.ads, 3asoccon.ads,
	3bsoccon.ads, 3gsoccon.ads, 3hsoccon.ads, 3ssoccon.ads,
	3ssoliop.ads, 3wsoccon.ads, 3wsocthi.adb, 3wsocthi.ads,
	3wsoliop.ads, 41intnam.ads, 42intnam.ads, 4aintnam.ads,
	4cintnam.ads, 4gintnam.ads, 4hexcpol.adb, 4hintnam.ads,
	4lintnam.ads, 4nintnam.ads, 4ointnam.ads, 4onumaux.ads,
	4pintnam.ads, 4sintnam.ads, 4vcaldel.adb, 4vcalend.adb,
	4vintnam.ads, 4wexcpol.adb, 4wintnam.ads, 4zintnam.ads,
	51osinte.adb, 51osinte.ads, 52osinte.adb, 52osinte.ads,
	53osinte.ads, 54osinte.ads, 5aosinte.adb, 5aosinte.ads,
	5asystem.ads, 5ataprop.adb, 5atasinf.ads, 5ataspri.ads,
	5atpopsp.adb, 5avxwork.ads, 5bosinte.adb, 5bosinte.ads,
	5bsystem.ads, 5cosinte.ads, 5esystem.ads, 5fintman.adb,
	5fosinte.ads, 5fsystem.ads, 5ftaprop.adb, 5ftasinf.ads,
	5ginterr.adb, 5gintman.adb, 5gmastop.adb, 5gosinte.ads,
	5gproinf.ads, 5gsystem.ads, 5gtaprop.adb, 5gtasinf.ads,
	5gtpgetc.adb, 5hosinte.adb, 5hosinte.ads, 5hsystem.ads,
	5htaprop.adb, 5htaspri.ads, 5htraceb.adb, 5iosinte.adb,
	5itaprop.adb, 5itaspri.ads, 5ksystem.ads, 5kvxwork.ads,
	5lintman.adb, 5lml-tgt.adb, 5losinte.ads, 5lsystem.ads,
	5mvxwork.ads, 5ninmaop.adb, 5nintman.adb, 5nosinte.ads,
	5ntaprop.adb, 5ntaspri.ads, 5ointerr.adb, 5omastop.adb,
	5oosinte.adb, 5oosinte.ads, 5oosprim.adb, 5oparame.adb,
	5osystem.ads, 5otaprop.adb, 5otaspri.ads, 5posinte.ads,
	5posprim.adb, 5pvxwork.ads, 5sintman.adb, 5sosinte.adb,
	5sosinte.ads, 5ssystem.ads, 5staprop.adb, 5stasinf.ads,
	5staspri.ads, 5svxwork.ads, 5tosinte.ads, 5vasthan.adb,
	5vinmaop.adb, 5vinterr.adb, 5vintman.adb, 5vintman.ads,
	5vmastop.adb, 5vosinte.adb, 5vosinte.ads, 5vosprim.adb,
	5vsystem.ads, 5vtaprop.adb, 5vtaspri.ads, 5vtpopde.adb,
	5vtpopde.ads, 5wgloloc.adb, 5wintman.adb, 5wmemory.adb,
	5wosprim.adb, 5wsystem.ads, 5wtaprop.adb, 5wtaspri.ads,
	5ysystem.ads, 5zinterr.adb, 5zintman.adb, 5zosinte.adb,
	5zosinte.ads, 5zosprim.adb, 5zsystem.ads, 5ztaprop.adb,
	6vcpp.adb, 6vcstrea.adb, 6vinterf.ads, 7sinmaop.adb,
	7sintman.adb, 7sosinte.adb, 7sosprim.adb, 7staprop.adb,
	7staspri.ads, 7stpopsp.adb, 7straceb.adb, 9drpc.adb,
	a-caldel.adb, a-caldel.ads, a-charac.ads, a-colien.ads,
	a-comlin.adb, adaint.c, adaint.h, ada-tree.def,
	a-diocst.adb, a-diocst.ads, a-direio.adb, a-except.adb,
	a-except.ads, a-excpol.adb, a-exctra.adb, a-exctra.ads,
	a-filico.adb, a-interr.adb, a-intsig.adb, a-intsig.ads,
	ali.adb, ali.ads, ali-util.adb, ali-util.ads,
	a-ngcefu.adb, a-ngcoty.adb, a-ngelfu.adb, a-nudira.adb,
	a-nudira.ads, a-nuflra.adb, a-nuflra.ads, a-reatim.adb,
	a-reatim.ads, a-retide.ads, a-sequio.adb, a-siocst.adb,
	a-siocst.ads, a-ssicst.adb, a-ssicst.ads, a-strbou.adb,
	a-strbou.ads, a-strfix.adb, a-strmap.adb, a-strsea.ads,
	a-strunb.adb, a-strunb.ads, a-ststio.adb, a-stunau.adb,
	a-stunau.ads, a-stwibo.adb, a-stwibo.ads, a-stwifi.adb,
	a-stwima.adb, a-stwiun.adb, a-stwiun.ads, a-tags.adb,
	a-tags.ads, a-tasatt.adb, a-taside.adb, a-teioed.adb,
	a-textio.adb, a-textio.ads, a-tienau.adb, a-tifiio.adb,
	a-tiflau.adb, a-tiflio.adb, a-tigeau.adb, a-tigeau.ads,
	a-tiinau.adb, a-timoau.adb, a-tiocst.adb, a-tiocst.ads,
	atree.adb, atree.ads, a-witeio.adb, a-witeio.ads,
	a-wtcstr.adb, a-wtcstr.ads, a-wtdeio.adb, a-wtedit.adb,
	a-wtenau.adb, a-wtflau.adb, a-wtinau.adb, a-wtmoau.adb,
	bcheck.adb, binde.adb, bindgen.adb, bindusg.adb,
	checks.adb, checks.ads, cio.c, comperr.adb,
	comperr.ads, csets.adb, cstand.adb, cstreams.c,
	debug_a.adb, debug_a.ads, debug.adb, decl.c,
	einfo.adb, einfo.ads, errout.adb, errout.ads,
	eval_fat.adb, eval_fat.ads, exp_aggr.adb, expander.adb,
	expander.ads, exp_attr.adb, exp_ch11.adb, exp_ch13.adb,
	exp_ch2.adb, exp_ch3.adb, exp_ch3.ads, exp_ch4.adb,
	exp_ch5.adb, exp_ch6.adb, exp_ch7.adb, exp_ch7.ads,
	exp_ch8.adb, exp_ch9.adb, exp_code.adb, exp_dbug.adb,
	exp_dbug.ads, exp_disp.adb, exp_dist.adb, expect.c,
	exp_fixd.adb, exp_imgv.adb, exp_intr.adb, exp_pakd.adb,
	exp_prag.adb, exp_strm.adb, exp_strm.ads, exp_tss.adb,
	exp_tss.ads, exp_util.adb, exp_util.ads, exp_vfpt.adb,
	fe.h, fmap.adb, fmap.ads, fname.adb,
	fname.ads, fname-uf.adb, fname-uf.ads, freeze.adb,
	freeze.ads, frontend.adb, g-awk.adb, g-awk.ads,
	g-busora.adb, g-busora.ads, g-busorg.adb, g-busorg.ads,
	g-casuti.adb, g-casuti.ads, g-catiio.adb, g-catiio.ads,
	g-cgi.adb, g-cgi.ads, g-cgicoo.adb, g-cgicoo.ads,
	g-cgideb.adb, g-cgideb.ads, g-comlin.adb, g-comlin.ads,
	g-crc32.adb, g-crc32.ads, g-debpoo.adb, g-debpoo.ads,
	g-debuti.adb, g-debuti.ads, g-diopit.adb, g-diopit.ads,
	g-dirope.adb, g-dirope.ads, g-dyntab.adb, g-dyntab.ads,
	g-except.ads, g-exctra.adb, g-exctra.ads, g-expect.adb,
	g-expect.ads, g-hesora.adb, g-hesora.ads, g-hesorg.adb,
	g-hesorg.ads, g-htable.adb, g-htable.ads, gigi.h,
	g-io.adb, g-io.ads, g-io_aux.adb, g-io_aux.ads,
	g-locfil.adb, g-locfil.ads, g-md5.adb, g-md5.ads,
	gmem.c, gnat1drv.adb, gnatbind.adb, gnatchop.adb,
	gnatcmd.adb, gnatfind.adb, gnatkr.adb, gnatlbr.adb,
	gnatlink.adb, gnatls.adb, gnatmake.adb, gnatmem.adb,
	gnatname.adb, gnatprep.adb, gnatprep.ads, gnatpsta.adb,
	gnatxref.adb, g-os_lib.adb, g-os_lib.ads, g-regexp.adb,
	g-regexp.ads, g-regist.adb, g-regist.ads, g-regpat.adb,
	g-regpat.ads, g-soccon.ads, g-socket.adb, g-socket.ads,
	g-socthi.adb, g-socthi.ads, g-soliop.ads, g-souinf.ads,
	g-speche.adb, g-speche.ads, g-spipat.adb, g-spipat.ads,
	g-spitbo.adb, g-spitbo.ads, g-sptabo.ads, g-sptain.ads,
	g-sptavs.ads, g-table.adb, g-table.ads, g-tasloc.adb,
	g-tasloc.ads, g-thread.adb, g-thread.ads, g-traceb.adb,
	g-traceb.ads, g-trasym.adb, g-trasym.ads, hostparm.ads,
	i-c.ads, i-cobol.adb, i-cpp.adb, i-cstrea.ads,
	i-cstrin.adb, i-cstrin.ads, impunit.adb, init.c,
	inline.adb, interfac.ads, i-pacdec.ads, itypes.adb,
	itypes.ads, i-vxwork.ads, lang.opt, lang-specs.h,
	layout.adb, lib.adb, lib.ads, lib-list.adb,
	lib-load.adb, lib-load.ads, lib-sort.adb, lib-util.adb,
	lib-writ.adb, lib-writ.ads, lib-xref.adb, lib-xref.ads,
	link.c, live.adb, make.adb, make.ads,
	Makefile.adalib, Makefile.in, Make-lang.in, makeusg.adb,
	mdll.adb, mdll-fil.adb, mdll-fil.ads, mdll-utl.adb,
	mdll-utl.ads, memroot.adb, memroot.ads, memtrack.adb,
	misc.c, mkdir.c, mlib.adb, mlib.ads,
	mlib-fil.adb, mlib-fil.ads, mlib-prj.adb, mlib-prj.ads,
	mlib-tgt.adb, mlib-tgt.ads, mlib-utl.adb, mlib-utl.ads,
	namet.adb, namet.ads, namet.h, nlists.ads,
	nlists.h, nmake.adt, opt.adb, opt.ads,
	osint.adb, osint.ads, osint-b.adb, osint-c.adb,
	par.adb, par-ch10.adb, par-ch11.adb, par-ch2.adb,
	par-ch3.adb, par-ch4.adb, par-ch5.adb, par-ch6.adb,
	par-ch9.adb, par-endh.adb, par-labl.adb, par-load.adb,
	par-prag.adb, par-sync.adb, par-tchk.adb, par-util.adb,
	prj.adb, prj.ads, prj-attr.adb, prj-attr.ads,
	prj-com.adb, prj-com.ads, prj-dect.adb, prj-dect.ads,
	prj-env.adb, prj-env.ads, prj-ext.adb, prj-ext.ads,
	prj-makr.adb, prj-makr.ads, prj-nmsc.adb, prj-nmsc.ads,
	prj-pars.adb, prj-pars.ads, prj-part.adb, prj-part.ads,
	prj-pp.adb, prj-pp.ads, prj-proc.adb, prj-proc.ads,
	prj-strt.adb, prj-strt.ads, prj-tree.adb, prj-tree.ads,
	prj-util.adb, prj-util.ads, raise.c, raise.h,
	repinfo.adb, repinfo.h, restrict.adb, restrict.ads,
	rident.ads, rtsfind.adb, rtsfind.ads, s-addima.ads,
	s-arit64.adb, s-assert.adb, s-assert.ads, s-atacco.adb,
	s-atacco.ads, s-auxdec.adb, s-auxdec.ads, s-bitops.adb,
	scans.ads, scn.adb, scn.ads, s-crc32.adb,
	s-crc32.ads, s-direio.adb, sem.adb, sem.ads,
	sem_aggr.adb, sem_attr.adb, sem_attr.ads, sem_case.adb,
	sem_case.ads, sem_cat.adb, sem_cat.ads, sem_ch10.adb,
	sem_ch11.adb, sem_ch12.adb, sem_ch12.ads, sem_ch13.adb,
	sem_ch13.ads, sem_ch3.adb, sem_ch3.ads, sem_ch4.adb,
	sem_ch5.adb, sem_ch5.ads, sem_ch6.adb, sem_ch6.ads,
	sem_ch7.adb, sem_ch7.ads, sem_ch8.adb, sem_ch8.ads,
	sem_ch9.adb, sem_disp.adb, sem_disp.ads, sem_dist.adb,
	sem_elab.adb, sem_eval.adb, sem_eval.ads, sem_intr.adb,
	sem_maps.adb, sem_mech.adb, sem_prag.adb, sem_prag.ads,
	sem_res.adb, sem_res.ads, sem_type.adb, sem_type.ads,
	sem_util.adb, sem_util.ads, sem_warn.adb, s-errrep.adb,
	s-errrep.ads, s-exctab.adb, s-exctab.ads, s-exnint.ads,
	s-exnllf.ads, s-exnlli.ads, s-expint.ads, s-explli.ads,
	s-expuns.ads, s-fatflt.ads, s-fatgen.adb, s-fatgen.ads,
	s-fatlfl.ads, s-fatllf.ads, s-fatsfl.ads, s-fileio.adb,
	s-fileio.ads, s-finimp.adb, s-finimp.ads, s-finroo.adb,
	s-finroo.ads, sfn_scan.adb, s-gloloc.adb, s-gloloc.ads,
	s-imgdec.adb, s-imgenu.adb, s-imgrea.adb, s-imgwch.adb,
	sinfo.adb, sinfo.ads, s-inmaop.ads, sinput.adb,
	sinput.ads, sinput-d.adb, sinput-l.adb, sinput-l.ads,
	sinput-p.adb, sinput-p.ads, s-interr.adb, s-interr.ads,
	s-intman.ads, s-maccod.ads, s-mastop.adb, s-mastop.ads,
	s-memory.adb, s-memory.ads, snames.adb, snames.ads,
	snames.h, s-osprim.ads, s-parame.ads, s-parint.ads,
	s-pooloc.adb, s-pooloc.ads, s-poosiz.adb, sprint.adb,
	s-proinf.ads, s-scaval.ads, s-secsta.adb, s-secsta.ads,
	s-sequio.adb, s-shasto.adb, s-shasto.ads, s-soflin.ads,
	s-stache.adb, s-stache.ads, s-stalib.adb, s-stalib.ads,
	s-stoele.ads, s-stopoo.ads, s-stratt.adb, s-stratt.ads,
	s-strops.adb, s-strops.ads, s-taasde.adb, s-taasde.ads,
	s-tadeca.adb, s-tadeca.ads, s-tadert.adb, s-tadert.ads,
	s-taenca.adb, s-taenca.ads, s-taprob.adb, s-taprob.ads,
	s-taprop.ads, s-tarest.adb, s-tarest.ads, s-tasdeb.adb,
	s-tasdeb.ads, s-tasinf.adb, s-tasinf.ads, s-tasini.adb,
	s-tasini.ads, s-taskin.adb, s-taskin.ads, s-tasque.adb,
	s-tasque.ads, s-tasren.adb, s-tasren.ads, s-tasres.ads,
	s-tassta.adb, s-tassta.ads, s-tasuti.adb, s-tasuti.ads,
	s-tataat.adb, s-tataat.ads, s-tpinop.adb, s-tpinop.ads,
	s-tpoben.adb, s-tpoben.ads, s-tpobop.adb, s-tpobop.ads,
	s-tposen.adb, s-tposen.ads, s-traceb.adb, s-traceb.ads,
	stringt.adb, stringt.ads, stringt.h, style.ads,
	stylesw.adb, stylesw.ads, s-unstyp.ads, s-vaflop.ads,
	s-valrea.adb, s-valuti.adb, s-vercon.adb, s-vmexta.adb,
	s-wchcnv.ads, s-wchcon.ads, s-widcha.adb, switch.adb,
	switch.ads, switch-b.adb, switch-c.adb, switch-m.adb,
	s-wwdcha.adb, s-wwdwch.adb, sysdep.c, system.ads,
	table.adb, table.ads, targparm.adb, targparm.ads,
	targtyps.c, tbuild.adb, tbuild.ads, tracebak.c,
	trans.c, tree_io.adb, treepr.adb, treeprs.adt,
	ttypes.ads, types.ads, types.h, uintp.adb,
	uintp.ads, uintp.h, uname.adb, urealp.adb,
	urealp.ads, urealp.h, usage.adb, utils2.c,
	utils.c, validsw.adb, validsw.ads, widechar.adb,
	xeinfo.adb, xnmake.adb, xref_lib.adb, xref_lib.ads,
	xr_tabls.adb, xr_tabls.ads, xtreeprs.adb, xsnames.adb,
	einfo.h, sinfo.h, treeprs.ads, nmake.ads, nmake.adb,
	gnatvsn.ads: Merge with ACT tree.

	* gnatvsn.adb: Rewritten in a simpler and more efficient way.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@72751 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 1201 insertions, 0 deletions

diff --git a/gcc/ada/56taprop.adb b/gcc/ada/56taprop.adb
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@@ -0,0 +1,1201 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--     S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S    --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--         Copyright (C) 1992-2003, Free Software Foundation, Inc.          --
+--                                                                          --
+-- GNARL is free software; you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
+-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNARL; see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University.       --
+-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is a LynxOS version of this file, adapted to make
+--  SCHED_FIFO and ceiling locking (Annex D compliance) work properly
+
+--  This package contains all the GNULL primitives that interface directly
+--  with the underlying OS.
+
+pragma Polling (Off);
+--  Turn off polling, we do not want ATC polling to take place during
+--  tasking operations. It causes infinite loops and other problems.
+
+with System.Tasking.Debug;
+--  used for Known_Tasks
+
+with System.Task_Info;
+--  used for Task_Info_Type
+
+with Interfaces.C;
+--  used for int
+--           size_t
+
+with System.Interrupt_Management;
+--  used for Keep_Unmasked
+--           Abort_Task_Interrupt
+--           Interrupt_ID
+
+with System.Interrupt_Management.Operations;
+--  used for Set_Interrupt_Mask
+--           All_Tasks_Mask
+pragma Elaborate_All (System.Interrupt_Management.Operations);
+
+with System.Parameters;
+--  used for Size_Type
+
+with System.Tasking;
+--  used for Ada_Task_Control_Block
+--           Task_ID
+
+with System.Soft_Links;
+--  used for Defer/Undefer_Abort
+
+--  Note that we do not use System.Tasking.Initialization directly since
+--  this is a higher level package that we shouldn't depend on. For example
+--  when using the restricted run time, it is replaced by
+--  System.Tasking.Restricted.Initialization
+
+with System.OS_Primitives;
+--  used for Delay_Modes
+
+with Unchecked_Conversion;
+with Unchecked_Deallocation;
+
+package body System.Task_Primitives.Operations is
+
+   use System.Tasking.Debug;
+   use System.Tasking;
+   use Interfaces.C;
+   use System.OS_Interface;
+   use System.Parameters;
+   use System.OS_Primitives;
+
+   package SSL renames System.Soft_Links;
+
+   ----------------
+   -- Local Data --
+   ----------------
+
+   --  The followings are logically constants, but need to be initialized
+   --  at run time.
+
+   Single_RTS_Lock : aliased RTS_Lock;
+   --  This is a lock to allow only one thread of control in the RTS at
+   --  a time; it is used to execute in mutual exclusion from all other tasks.
+   --  Used mainly in Single_Lock mode, but also to protect All_Tasks_List
+
+   ATCB_Key : aliased pthread_key_t;
+   --  Key used to find the Ada Task_ID associated with a thread
+
+   Environment_Task_ID : Task_ID;
+   --  A variable to hold Task_ID for the environment task.
+
+   Locking_Policy : Character;
+   pragma Import (C, Locking_Policy, "__gl_locking_policy");
+   --  Value of the pragma Locking_Policy:
+   --    'C' for Ceiling_Locking
+   --    'I' for Inherit_Locking
+   --    ' ' for none.
+
+   Unblocked_Signal_Mask : aliased sigset_t;
+   --  The set of signals that should unblocked in all tasks
+
+   --  The followings are internal configuration constants needed.
+
+   Next_Serial_Number : Task_Serial_Number := 100;
+   --  We start at 100, to reserve some special values for
+   --  using in error checking.
+
+   Time_Slice_Val : Integer;
+   pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
+
+   Dispatching_Policy : Character;
+   pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
+
+   FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
+   --  Indicates whether FIFO_Within_Priorities is set.
+
+   Foreign_Task_Elaborated : aliased Boolean := True;
+   --  Used to identified fake tasks (i.e., non-Ada Threads).
+
+   --------------------
+   -- Local Packages --
+   --------------------
+
+   package Specific is
+
+      procedure Initialize (Environment_Task : Task_ID);
+      pragma Inline (Initialize);
+      --  Initialize various data needed by this package.
+
+      function Is_Valid_Task return Boolean;
+      pragma Inline (Is_Valid_Task);
+      --  Does the current thread have an ATCB?
+
+      procedure Set (Self_Id : Task_ID);
+      pragma Inline (Set);
+      --  Set the self id for the current task.
+
+      function Self return Task_ID;
+      pragma Inline (Self);
+      --  Return a pointer to the Ada Task Control Block of the calling task.
+
+   end Specific;
+
+   package body Specific is separate;
+   --  The body of this package is target specific.
+
+   ---------------------------------
+   -- Support for foreign threads --
+   ---------------------------------
+
+   function Register_Foreign_Thread (Thread : Thread_Id) return Task_ID;
+   --  Allocate and Initialize a new ATCB for the current Thread.
+
+   function Register_Foreign_Thread
+     (Thread : Thread_Id) return Task_ID is separate;
+
+   -----------------------
+   -- Local Subprograms --
+   -----------------------
+
+   procedure Abort_Handler (Sig : Signal);
+   --  Signal handler used to implement asynchronous abort.
+
+   procedure Set_OS_Priority (T : Task_ID; Prio : System.Any_Priority);
+   --  This procedure calls the scheduler of the OS to set thread's priority
+
+   function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
+
+   -------------------
+   -- Abort_Handler --
+   -------------------
+
+   procedure Abort_Handler (Sig : Signal) is
+      pragma Unreferenced (Sig);
+
+      T       : Task_ID := Self;
+      Result  : Interfaces.C.int;
+      Old_Set : aliased sigset_t;
+
+   begin
+      --  It is not safe to raise an exception when using ZCX and the GCC
+      --  exception handling mechanism.
+
+      if ZCX_By_Default and then GCC_ZCX_Support then
+         return;
+      end if;
+
+      if T.Deferral_Level = 0
+        and then T.Pending_ATC_Level < T.ATC_Nesting_Level and then
+        not T.Aborting
+      then
+         T.Aborting := True;
+
+         --  Make sure signals used for RTS internal purpose are unmasked
+
+         Result := pthread_sigmask (SIG_UNBLOCK,
+           Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
+         pragma Assert (Result = 0);
+
+         raise Standard'Abort_Signal;
+      end if;
+   end Abort_Handler;
+
+   -----------------
+   -- Stack_Guard --
+   -----------------
+
+   procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
+      Stack_Base : constant Address := Get_Stack_Base (T.Common.LL.Thread);
+      Guard_Page_Address : Address;
+
+      Res : Interfaces.C.int;
+
+   begin
+      if Stack_Base_Available then
+
+         --  Compute the guard page address
+
+         Guard_Page_Address :=
+           Stack_Base - (Stack_Base mod Get_Page_Size) + Get_Page_Size;
+
+         if On then
+            Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_ON);
+         else
+            Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_OFF);
+         end if;
+
+         pragma Assert (Res = 0);
+      end if;
+   end Stack_Guard;
+
+   --------------------
+   -- Get_Thread_Id  --
+   --------------------
+
+   function Get_Thread_Id (T : ST.Task_ID) return OSI.Thread_Id is
+   begin
+      return T.Common.LL.Thread;
+   end Get_Thread_Id;
+
+   ----------
+   -- Self --
+   ----------
+
+   function Self return Task_ID renames Specific.Self;
+
+   ---------------------
+   -- Initialize_Lock --
+   ---------------------
+
+   procedure Initialize_Lock
+     (Prio : System.Any_Priority;
+      L    : access Lock)
+   is
+      Attributes : aliased pthread_mutexattr_t;
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutexattr_init (Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         raise Storage_Error;
+      end if;
+
+      if Locking_Policy = 'C' then
+         L.Ceiling := Prio;
+      end if;
+
+      Result := pthread_mutex_init (L.Mutex'Access, Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         raise Storage_Error;
+      end if;
+
+      Result := pthread_mutexattr_destroy (Attributes'Access);
+      pragma Assert (Result = 0);
+   end Initialize_Lock;
+
+   procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
+      pragma Unreferenced (Level);
+
+      Attributes : aliased pthread_mutexattr_t;
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutexattr_init (Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         raise Storage_Error;
+      end if;
+
+      Result := pthread_mutex_init (L, Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         Result := pthread_mutexattr_destroy (Attributes'Access);
+         raise Storage_Error;
+      end if;
+
+      Result := pthread_mutexattr_destroy (Attributes'Access);
+      pragma Assert (Result = 0);
+   end Initialize_Lock;
+
+   -------------------
+   -- Finalize_Lock --
+   -------------------
+
+   procedure Finalize_Lock (L : access Lock) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_destroy (L.Mutex'Access);
+      pragma Assert (Result = 0);
+   end Finalize_Lock;
+
+   procedure Finalize_Lock (L : access RTS_Lock) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_destroy (L);
+      pragma Assert (Result = 0);
+   end Finalize_Lock;
+
+   ----------------
+   -- Write_Lock --
+   ----------------
+
+   procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
+      Result : Interfaces.C.int;
+      T : constant Task_ID := Self;
+
+   begin
+      if Locking_Policy = 'C' then
+         if T.Common.Current_Priority > L.Ceiling then
+            Ceiling_Violation := True;
+            return;
+         end if;
+
+         L.Saved_Priority := T.Common.Current_Priority;
+
+         if T.Common.Current_Priority < L.Ceiling then
+            Set_OS_Priority (T, L.Ceiling);
+         end if;
+      end if;
+
+      Result := pthread_mutex_lock (L.Mutex'Access);
+
+      --  Assume that the cause of EINVAL is a priority ceiling violation
+
+      Ceiling_Violation := (Result = EINVAL);
+      pragma Assert (Result = 0 or else Result = EINVAL);
+   end Write_Lock;
+
+   --  No tricks on RTS_Locks
+
+   procedure Write_Lock
+     (L : access RTS_Lock; Global_Lock : Boolean := False)
+   is
+      Result : Interfaces.C.int;
+
+   begin
+      if not Single_Lock or else Global_Lock then
+         Result := pthread_mutex_lock (L);
+         pragma Assert (Result = 0);
+      end if;
+   end Write_Lock;
+
+   procedure Write_Lock (T : Task_ID) is
+      Result : Interfaces.C.int;
+   begin
+      if not Single_Lock then
+         Result := pthread_mutex_lock (T.Common.LL.L'Access);
+         pragma Assert (Result = 0);
+      end if;
+   end Write_Lock;
+
+   ---------------
+   -- Read_Lock --
+   ---------------
+
+   procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
+   begin
+      Write_Lock (L, Ceiling_Violation);
+   end Read_Lock;
+
+   ------------
+   -- Unlock --
+   ------------
+
+   procedure Unlock (L : access Lock) is
+      Result : Interfaces.C.int;
+      T : constant Task_ID := Self;
+
+   begin
+      Result := pthread_mutex_unlock (L.Mutex'Access);
+      pragma Assert (Result = 0);
+
+      if Locking_Policy = 'C' then
+         if T.Common.Current_Priority > L.Saved_Priority then
+            Set_OS_Priority (T, L.Saved_Priority);
+         end if;
+      end if;
+   end Unlock;
+
+   procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
+      Result : Interfaces.C.int;
+
+   begin
+      if not Single_Lock or else Global_Lock then
+         Result := pthread_mutex_unlock (L);
+         pragma Assert (Result = 0);
+      end if;
+   end Unlock;
+
+   procedure Unlock (T : Task_ID) is
+      Result : Interfaces.C.int;
+
+   begin
+      if not Single_Lock then
+         Result := pthread_mutex_unlock (T.Common.LL.L'Access);
+         pragma Assert (Result = 0);
+      end if;
+   end Unlock;
+
+   -----------
+   -- Sleep --
+   -----------
+
+   procedure Sleep
+     (Self_ID : Task_ID;
+      Reason   : System.Tasking.Task_States)
+   is
+      pragma Unreferenced (Reason);
+
+      Result : Interfaces.C.int;
+
+   begin
+      if Single_Lock then
+         Result := pthread_cond_wait
+           (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
+      else
+         Result := pthread_cond_wait
+           (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
+      end if;
+
+      --  EINTR is not considered a failure.
+
+      pragma Assert (Result = 0 or else Result = EINTR);
+   end Sleep;
+
+   -----------------
+   -- Timed_Sleep --
+   -----------------
+
+   --  This is for use within the run-time system, so abort is
+   --  assumed to be already deferred, and the caller should be
+   --  holding its own ATCB lock.
+
+   procedure Timed_Sleep
+     (Self_ID  : Task_ID;
+      Time     : Duration;
+      Mode     : ST.Delay_Modes;
+      Reason   : Task_States;
+      Timedout : out Boolean;
+      Yielded  : out Boolean)
+   is
+      pragma Unreferenced (Reason);
+
+      Check_Time : constant Duration := Monotonic_Clock;
+      Rel_Time   : Duration;
+      Abs_Time   : Duration;
+      Request    : aliased timespec;
+      Result     : Interfaces.C.int;
+
+   begin
+      Timedout := True;
+      Yielded := False;
+
+      if Mode = Relative then
+         Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
+
+         if Relative_Timed_Wait then
+            Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
+         end if;
+
+      else
+         Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
+
+         if Relative_Timed_Wait then
+            Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
+         end if;
+      end if;
+
+      if Abs_Time > Check_Time then
+         if Relative_Timed_Wait then
+            Request := To_Timespec (Rel_Time);
+         else
+            Request := To_Timespec (Abs_Time);
+         end if;
+
+         loop
+            exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
+              or else Self_ID.Pending_Priority_Change;
+
+            if Single_Lock then
+               Result := pthread_cond_timedwait
+                 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
+                  Request'Access);
+
+            else
+               Result := pthread_cond_timedwait
+                 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
+                  Request'Access);
+            end if;
+
+            exit when Abs_Time <= Monotonic_Clock;
+
+            if Result = 0 or Result = EINTR then
+
+               --  Somebody may have called Wakeup for us
+
+               Timedout := False;
+               exit;
+            end if;
+
+            pragma Assert (Result = ETIMEDOUT);
+         end loop;
+      end if;
+   end Timed_Sleep;
+
+   -----------------
+   -- Timed_Delay --
+   -----------------
+
+   --  This is for use in implementing delay statements, so we assume
+   --  the caller is abort-deferred but is holding no locks.
+
+   procedure Timed_Delay
+     (Self_ID  : Task_ID;
+      Time     : Duration;
+      Mode     : ST.Delay_Modes)
+   is
+      Check_Time : constant Duration := Monotonic_Clock;
+      Abs_Time   : Duration;
+      Rel_Time   : Duration;
+      Request    : aliased timespec;
+      Result     : Interfaces.C.int;
+
+   begin
+      --  Only the little window between deferring abort and
+      --  locking Self_ID is the reason we need to
+      --  check for pending abort and priority change below!
+
+      SSL.Abort_Defer.all;
+
+      if Single_Lock then
+         Lock_RTS;
+      end if;
+
+      --  Comments needed in code below ???
+
+      Write_Lock (Self_ID);
+
+      if Mode = Relative then
+         Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
+
+         if Relative_Timed_Wait then
+            Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
+         end if;
+
+      else
+         Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
+
+         if Relative_Timed_Wait then
+            Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
+         end if;
+      end if;
+
+      if Abs_Time > Check_Time then
+         if Relative_Timed_Wait then
+            Request := To_Timespec (Rel_Time);
+         else
+            Request := To_Timespec (Abs_Time);
+         end if;
+
+         Self_ID.Common.State := Delay_Sleep;
+
+         loop
+            if Self_ID.Pending_Priority_Change then
+               Self_ID.Pending_Priority_Change := False;
+               Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
+               Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
+            end if;
+
+            exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
+
+            if Single_Lock then
+               Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
+                 Single_RTS_Lock'Access, Request'Access);
+            else
+               Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
+                 Self_ID.Common.LL.L'Access, Request'Access);
+            end if;
+
+            exit when Abs_Time <= Monotonic_Clock;
+
+            pragma Assert (Result = 0
+                             or else Result = ETIMEDOUT
+                             or else Result = EINTR);
+         end loop;
+
+         Self_ID.Common.State := Runnable;
+      end if;
+
+      Unlock (Self_ID);
+
+      if Single_Lock then
+         Unlock_RTS;
+      end if;
+
+      Result := sched_yield;
+      SSL.Abort_Undefer.all;
+   end Timed_Delay;
+
+   ---------------------
+   -- Monotonic_Clock --
+   ---------------------
+
+   function Monotonic_Clock return Duration is
+      TS     : aliased timespec;
+      Result : Interfaces.C.int;
+
+   begin
+      Result := clock_gettime
+        (clock_id => CLOCK_REALTIME, tp => TS'Unchecked_Access);
+      pragma Assert (Result = 0);
+      return To_Duration (TS);
+   end Monotonic_Clock;
+
+   -------------------
+   -- RT_Resolution --
+   -------------------
+
+   function RT_Resolution return Duration is
+      Res    : aliased timespec;
+      Result : Interfaces.C.int;
+
+   begin
+      Result := clock_getres
+        (clock_id => CLOCK_REALTIME, Res => Res'Unchecked_Access);
+      pragma Assert (Result = 0);
+      return To_Duration (Res);
+   end RT_Resolution;
+
+   ------------
+   -- Wakeup --
+   ------------
+
+   procedure Wakeup (T : Task_ID; Reason : System.Tasking.Task_States) is
+      pragma Unreferenced (Reason);
+
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_cond_signal (T.Common.LL.CV'Access);
+      pragma Assert (Result = 0);
+   end Wakeup;
+
+   -----------
+   -- Yield --
+   -----------
+
+   procedure Yield (Do_Yield : Boolean := True) is
+      Result : Interfaces.C.int;
+
+   begin
+      if Do_Yield then
+         Result := sched_yield;
+      end if;
+   end Yield;
+
+   ------------------
+   -- Set_Priority --
+   ------------------
+
+   procedure Set_OS_Priority (T : Task_ID; Prio : System.Any_Priority) is
+      Result : Interfaces.C.int;
+      Param  : aliased struct_sched_param;
+
+   begin
+      Param.sched_priority := Interfaces.C.int (Prio);
+
+      if Time_Slice_Supported and then Time_Slice_Val > 0 then
+         Result := pthread_setschedparam
+           (T.Common.LL.Thread, SCHED_RR, Param'Access);
+
+      elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
+         Result := pthread_setschedparam
+           (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
+
+      else
+         Result := pthread_setschedparam
+           (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
+      end if;
+
+      pragma Assert (Result = 0);
+   end Set_OS_Priority;
+
+   type Prio_Array_Type is array (System.Any_Priority) of Integer;
+   pragma Atomic_Components (Prio_Array_Type);
+   Prio_Array : Prio_Array_Type;
+   --  Comments needed for these declarations ???
+
+   procedure Set_Priority
+     (T                   : Task_ID;
+      Prio                : System.Any_Priority;
+      Loss_Of_Inheritance : Boolean := False)
+   is
+      Array_Item : Integer;
+
+   begin
+      Set_OS_Priority (T, Prio);
+
+      if Locking_Policy = 'C' then
+         --  Annex D requirements: loss of inheritance puts task at the
+         --  beginning of the queue for that prio; copied from 5ztaprop
+         --  (VxWorks)
+
+         if Loss_Of_Inheritance
+           and then Prio < T.Common.Current_Priority then
+
+            Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
+            Prio_Array (T.Common.Base_Priority) := Array_Item;
+
+            loop
+               Yield;
+               exit when Array_Item = Prio_Array (T.Common.Base_Priority)
+                 or else Prio_Array (T.Common.Base_Priority) = 1;
+            end loop;
+
+            Prio_Array (T.Common.Base_Priority) :=
+              Prio_Array (T.Common.Base_Priority) - 1;
+         end if;
+      end if;
+
+      T.Common.Current_Priority := Prio;
+   end Set_Priority;
+
+   ------------------
+   -- Get_Priority --
+   ------------------
+
+   function Get_Priority (T : Task_ID) return System.Any_Priority is
+   begin
+      return T.Common.Current_Priority;
+   end Get_Priority;
+
+   ----------------
+   -- Enter_Task --
+   ----------------
+
+   procedure Enter_Task (Self_ID : Task_ID) is
+   begin
+      Self_ID.Common.LL.Thread := pthread_self;
+      Self_ID.Common.LL.LWP := lwp_self;
+
+      Specific.Set (Self_ID);
+
+      Lock_RTS;
+
+      for J in Known_Tasks'Range loop
+         if Known_Tasks (J) = null then
+            Known_Tasks (J) := Self_ID;
+            Self_ID.Known_Tasks_Index := J;
+            exit;
+         end if;
+      end loop;
+
+      Unlock_RTS;
+   end Enter_Task;
+
+   --------------
+   -- New_ATCB --
+   --------------
+
+   function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
+   begin
+      return new Ada_Task_Control_Block (Entry_Num);
+   end New_ATCB;
+
+   -------------------
+   -- Is_Valid_Task --
+   -------------------
+
+   function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
+
+   -----------------------------
+   -- Register_Foreign_Thread --
+   -----------------------------
+
+   function Register_Foreign_Thread return Task_ID is
+   begin
+      if Is_Valid_Task then
+         return Self;
+      else
+         return Register_Foreign_Thread (pthread_self);
+      end if;
+   end Register_Foreign_Thread;
+
+   ----------------------
+   --  Initialize_TCB  --
+   ----------------------
+
+   procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
+      Mutex_Attr : aliased pthread_mutexattr_t;
+      Result     : Interfaces.C.int;
+      Cond_Attr  : aliased pthread_condattr_t;
+
+   begin
+      --  Give the task a unique serial number.
+
+      Self_ID.Serial_Number := Next_Serial_Number;
+      Next_Serial_Number := Next_Serial_Number + 1;
+      pragma Assert (Next_Serial_Number /= 0);
+
+      if not Single_Lock then
+         Result := pthread_mutexattr_init (Mutex_Attr'Access);
+         pragma Assert (Result = 0 or else Result = ENOMEM);
+
+         if Result = 0 then
+            Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
+              Mutex_Attr'Access);
+            pragma Assert (Result = 0 or else Result = ENOMEM);
+         end if;
+
+         if Result /= 0 then
+            Succeeded := False;
+            return;
+         end if;
+
+         Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
+         pragma Assert (Result = 0);
+      end if;
+
+      Result := pthread_condattr_init (Cond_Attr'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = 0 then
+         Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
+           Cond_Attr'Access);
+         pragma Assert (Result = 0 or else Result = ENOMEM);
+      end if;
+
+      if Result = 0 then
+         Succeeded := True;
+      else
+         if not Single_Lock then
+            Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
+            pragma Assert (Result = 0);
+         end if;
+
+         Succeeded := False;
+      end if;
+
+      Result := pthread_condattr_destroy (Cond_Attr'Access);
+      pragma Assert (Result = 0);
+   end Initialize_TCB;
+
+   -----------------
+   -- Create_Task --
+   -----------------
+
+   procedure Create_Task
+     (T          : Task_ID;
+      Wrapper    : System.Address;
+      Stack_Size : System.Parameters.Size_Type;
+      Priority   : System.Any_Priority;
+      Succeeded  : out Boolean)
+   is
+      Attributes          : aliased pthread_attr_t;
+      Adjusted_Stack_Size : Interfaces.C.size_t;
+      Result              : Interfaces.C.int;
+
+      function Thread_Body_Access is new
+        Unchecked_Conversion (System.Address, Thread_Body);
+
+      use System.Task_Info;
+
+   begin
+      if Stack_Size = Unspecified_Size then
+         Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
+
+      elsif Stack_Size < Minimum_Stack_Size then
+         Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
+
+      else
+         Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
+      end if;
+
+      if Stack_Base_Available then
+         --  If Stack Checking is supported then allocate 2 additional pages:
+         --
+         --  In the worst case, stack is allocated at something like
+         --  N * Get_Page_Size - epsilon, we need to add the size for 2 pages
+         --  to be sure the effective stack size is greater than what
+         --  has been asked.
+
+         Adjusted_Stack_Size := Adjusted_Stack_Size + 2 * Get_Page_Size;
+      end if;
+
+      Result := pthread_attr_init (Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result /= 0 then
+         Succeeded := False;
+         return;
+      end if;
+
+      Result := pthread_attr_setdetachstate
+        (Attributes'Access, PTHREAD_CREATE_DETACHED);
+      pragma Assert (Result = 0);
+
+      Result := pthread_attr_setstacksize
+        (Attributes'Access, Adjusted_Stack_Size);
+      pragma Assert (Result = 0);
+
+      if T.Common.Task_Info /= Default_Scope then
+
+         --  We are assuming that Scope_Type has the same values than the
+         --  corresponding C macros
+
+         Result := pthread_attr_setscope
+           (Attributes'Access, Task_Info_Type'Pos (T.Common.Task_Info));
+         pragma Assert (Result = 0);
+      end if;
+
+      --  Since the initial signal mask of a thread is inherited from the
+      --  creator, and the Environment task has all its signals masked, we
+      --  do not need to manipulate caller's signal mask at this point.
+      --  All tasks in RTS will have All_Tasks_Mask initially.
+
+      Result := pthread_create
+        (T.Common.LL.Thread'Access,
+         Attributes'Access,
+         Thread_Body_Access (Wrapper),
+         To_Address (T));
+      pragma Assert (Result = 0 or else Result = EAGAIN);
+
+      Succeeded := Result = 0;
+
+      Result := pthread_attr_destroy (Attributes'Access);
+      pragma Assert (Result = 0);
+
+      Set_Priority (T, Priority);
+   end Create_Task;
+
+   ------------------
+   -- Finalize_TCB --
+   ------------------
+
+   procedure Finalize_TCB (T : Task_ID) is
+      Result : Interfaces.C.int;
+      Tmp    : Task_ID := T;
+      Is_Self : constant Boolean := T = Self;
+
+      procedure Free is new
+        Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
+
+   begin
+      if not Single_Lock then
+         Result := pthread_mutex_destroy (T.Common.LL.L'Access);
+         pragma Assert (Result = 0);
+      end if;
+
+      Result := pthread_cond_destroy (T.Common.LL.CV'Access);
+      pragma Assert (Result = 0);
+
+      if T.Known_Tasks_Index /= -1 then
+         Known_Tasks (T.Known_Tasks_Index) := null;
+      end if;
+
+      Free (Tmp);
+
+      if Is_Self then
+         Result := st_setspecific (ATCB_Key, System.Null_Address);
+         pragma Assert (Result = 0);
+      end if;
+
+   end Finalize_TCB;
+
+   ---------------
+   -- Exit_Task --
+   ---------------
+
+   procedure Exit_Task is
+   begin
+      Specific.Set (null);
+   end Exit_Task;
+
+   ----------------
+   -- Abort_Task --
+   ----------------
+
+   procedure Abort_Task (T : Task_ID) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_kill (T.Common.LL.Thread,
+        Signal (System.Interrupt_Management.Abort_Task_Interrupt));
+      pragma Assert (Result = 0);
+   end Abort_Task;
+
+   ----------------
+   -- Check_Exit --
+   ----------------
+
+   --  Dummy versions
+
+   function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
+      pragma Unreferenced (Self_ID);
+   begin
+      return True;
+   end Check_Exit;
+
+   --------------------
+   -- Check_No_Locks --
+   --------------------
+
+   function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
+      pragma Unreferenced (Self_ID);
+   begin
+      return True;
+   end Check_No_Locks;
+
+   ----------------------
+   -- Environment_Task --
+   ----------------------
+
+   function Environment_Task return Task_ID is
+   begin
+      return Environment_Task_ID;
+   end Environment_Task;
+
+   --------------
+   -- Lock_RTS --
+   --------------
+
+   procedure Lock_RTS is
+   begin
+      Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
+   end Lock_RTS;
+
+   ----------------
+   -- Unlock_RTS --
+   ----------------
+
+   procedure Unlock_RTS is
+   begin
+      Unlock (Single_RTS_Lock'Access, Global_Lock => True);
+   end Unlock_RTS;
+
+   ------------------
+   -- Suspend_Task --
+   ------------------
+
+   function Suspend_Task
+     (T           : ST.Task_ID;
+      Thread_Self : Thread_Id)
+      return        Boolean
+   is
+      pragma Unreferenced (T);
+      pragma Unreferenced (Thread_Self);
+
+   begin
+      return False;
+   end Suspend_Task;
+
+   -----------------
+   -- Resume_Task --
+   -----------------
+
+   function Resume_Task
+     (T           : ST.Task_ID;
+      Thread_Self : Thread_Id)
+      return        Boolean
+   is
+      pragma Unreferenced (T);
+      pragma Unreferenced (Thread_Self);
+
+   begin
+      return False;
+   end Resume_Task;
+
+   ----------------
+   -- Initialize --
+   ----------------
+
+   procedure Initialize (Environment_Task : Task_ID) is
+      act     : aliased struct_sigaction;
+      old_act : aliased struct_sigaction;
+      Tmp_Set : aliased sigset_t;
+      Result  : Interfaces.C.int;
+
+      function State
+        (Int  : System.Interrupt_Management.Interrupt_ID)
+         return Character;
+      pragma Import (C, State, "__gnat_get_interrupt_state");
+      --  Get interrupt state.  Defined in a-init.c
+      --  The input argument is the interrupt number,
+      --  and the result is one of the following:
+
+      Default : constant Character := 's';
+      --    'n'   this interrupt not set by any Interrupt_State pragma
+      --    'u'   Interrupt_State pragma set state to User
+      --    'r'   Interrupt_State pragma set state to Runtime
+      --    's'   Interrupt_State pragma set state to System (use "default"
+      --           system handler)
+
+   begin
+      Environment_Task_ID := Environment_Task;
+
+      --  Initialize the lock used to synchronize chain of all ATCBs.
+
+      Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
+
+      Specific.Initialize (Environment_Task);
+
+      Enter_Task (Environment_Task);
+
+      --  Install the abort-signal handler
+
+      if State (System.Interrupt_Management.Abort_Task_Interrupt)
+                                                     /= Default
+      then
+         act.sa_flags := 0;
+         act.sa_handler := Abort_Handler'Address;
+
+         Result := sigemptyset (Tmp_Set'Access);
+         pragma Assert (Result = 0);
+         act.sa_mask := Tmp_Set;
+
+         Result :=
+           sigaction
+           (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
+            act'Unchecked_Access,
+            old_act'Unchecked_Access);
+
+         pragma Assert (Result = 0);
+      end if;
+   end Initialize;
+
+begin
+   declare
+      Result : Interfaces.C.int;
+
+   begin
+      --  Mask Environment task for all signals. The original mask of the
+      --  Environment task will be recovered by Interrupt_Server task
+      --  during the elaboration of s-interr.adb.
+
+      System.Interrupt_Management.Operations.Set_Interrupt_Mask
+        (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
+
+      --  Prepare the set of signals that should unblocked in all tasks
+
+      Result := sigemptyset (Unblocked_Signal_Mask'Access);
+      pragma Assert (Result = 0);
+
+      for J in Interrupt_Management.Interrupt_ID loop
+         if System.Interrupt_Management.Keep_Unmasked (J) then
+            Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
+            pragma Assert (Result = 0);
+         end if;
+      end loop;
+   end;
+end System.Task_Primitives.Operations;