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cut out a syscall on thread creation in the case where guard size is 0

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Rich Felker
2011-03-16 11:36:21 -04:00
parent cc832d8a31
commit 29fae65780
1 changed files with 1 additions and 1 deletions
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src/thread/pthread_create.c
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@ -195,7 +195,7 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
size += __pthread_tsd_size; size += __pthread_tsd_size;
map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0); map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0);
if (!map) return EAGAIN; if (!map) return EAGAIN;
mprotect(map, guard, PROT_NONE); if (guard) mprotect(map, guard, PROT_NONE);
tsd = map + size - __pthread_tsd_size; tsd = map + size - __pthread_tsd_size;
new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new); new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);