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* m4/threadlib.m4 (gl_PTHREADLIB): Document that it sets
LIB_SCHED_YIELD.
(gl_PTHREADLIB_BODY): Set LIB_SCHED_YIELD (code moved here from
m4/yield.m4).
* m4/sched_yield.m4 (gl_FUNC_SCHED_YIELD): Require gl_PTHREADLIB, not
gl_THREADLIB and gl_YIELD.
* m4/yield.m4 (gl_YIELD): Require gl_PTHREADLIB. Determine YIELD_LIB
based on $(LIB_SCHED_YIELD).
* m4/threads.m4 (gl_THREADS_H): Don't require gl_YIELD. Use
$(LIB_SCHED_YIELD), not $(YIELD_LIB).
* modules/sched_yield (Files): Remove yield.m4. Add threadlib.m4.
(Depends-on): Remove threadlib.
(Link): Mention $(LIB_SCHED_YIELD), not $(YIELD_LIB).
* modules/threads-h (Files): Remove m4/yield.m4.
* modules/pthread-cond-tests (Makefile.am): Link the programs against
$(LIB_SCHED_YIELD), not $(YIELD_LIB).
* modules/pthread-mutex-tests (Makefile.am): Likewise.
* modules/pthread-once-tests (Makefile.am): Likewise.
* modules/pthread-rwlock-tests (Makefile.am): Likewise.
* modules/pthread-tss-tests (Makefile.am): Likewise.
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* lib/sched.in.h: Add _GL_FUNCDECL_RPL, _GL_WARN_ON_USE placeholders.
(sched_yield): New declaration.
* lib/sched_yield.c: New file.
* m4/sched_yield.m4: New file.
* m4/sched_h.m4 (gl_SCHED_H): Require gl_SCHED_H_DEFAULTS. Arrange to
provide a replacement sched.h always. Test whether sched_yield is
declared.
(gl_SCHED_MODULE_INDICATOR, gl_SCHED_H_DEFAULTS): New macros.
* modules/sched (Depends-on): Add snippet/c++defs, snippet/warn-on-use.
(Makefile.am): Provide a replacement sched.h always. Substitute
GNULIB_SCHED_YIELD, HAVE_SCHED_YIELD, REPLACE_SCHED_YIELD,
_GL_FUNCDECL_RPL, _GL_WARN_ON_USE.
* modules/sched_yield: New file.
* doc/posix-functions/sched_yield.texi: Mention the new module.
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