diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 40 |
1 files changed, 40 insertions, 0 deletions
@@ -5199,6 +5199,46 @@ Perl_my_clearenv(pTHX) #endif /* PERL_MICRO */ } +#ifdef PERL_IMPLICIT_CONTEXT + +/* implements the MY_CXT_INIT macro. The first time a module is loaded, +the global PL_my_cxt_index is incremented, and that value is assigned to +that module's static my_cxt_index (who's address is passed as an arg). +Then, for each interpreter this function is called for, it makes sure a +void* slot is available to hang the static data off, by allocating or +extending the interpreter's PL_my_cxt_list array */ + +void * +Perl_my_cxt_init(pTHX_ int *index, size_t size) +{ + void *p; + if (*index == -1) { + /* this module hasn't been allocated an index yet */ + MUTEX_LOCK(&PL_my_ctx_mutex); + *index = PL_my_cxt_index++; + MUTEX_UNLOCK(&PL_my_ctx_mutex); + } + + /* make sure the array is big enough */ + if (PL_my_cxt_size < *index + 1) { + if (PL_my_cxt_list) { + while (PL_my_cxt_size < *index + 1) + PL_my_cxt_size *= 2; + Renew(PL_my_cxt_list, PL_my_cxt_size, void *); + } + else { + PL_my_cxt_size = 16; + Newx(PL_my_cxt_list, PL_my_cxt_size, void *); + } + } + /* newSV() allocates one more than needed */ + p = (void*)SvPVX(newSV(size-1)); + PL_my_cxt_list[*index] = p; + Zero(p, size, char); + return p; +} +#endif + /* * Local variables: * c-indentation-style: bsd |