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Switch the defaults to not split the RLIMIT_STACK-sized initial thread

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stack into the stacks of the created threads.  Add knob
LIBPTHREAD_SPLITSTACK_MAIN to restore the older behaviour.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
This commit is contained in:
kib 2014-09-24 12:39:12 +00:00
parent b5f21a6a81
commit a14de80022
1 changed files with 4 additions and 3 deletions
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7
lib/libthr/thread/thr_init.c
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@ -445,7 +445,7 @@ init_private(void)
struct rlimit rlim;
size_t len;
int mib[2];
char *env;
char *env, *env_bigstack, *env_splitstack;
_thr_umutex_init(&_mutex_static_lock);
_thr_umutex_init(&_cond_static_lock);
@ -473,8 +473,9 @@ init_private(void)
len = sizeof (_usrstack);
if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
PANIC("Cannot get kern.usrstack from sysctl");
env = getenv("LIBPTHREAD_BIGSTACK_MAIN");
if (env != NULL) {
env_bigstack = getenv("LIBPTHREAD_BIGSTACK_MAIN");
env_splitstack = getenv("LIBPTHREAD_SPLITSTACK_MAIN");
if (env_bigstack != NULL || env_splitstack == NULL) {
if (getrlimit(RLIMIT_STACK, &rlim) == -1)
PANIC("Cannot get stack rlimit");
_thr_stack_initial = rlim.rlim_cur;