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For the process that already loaded libthr but still not initialized

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threading, fall back to libc method of performing
__pthread_map_stacks_exec() job.

Reported and tested by:	Mykola Dzham <i levsha me>
This commit is contained in:
Konstantin Belousov 2011-01-10 16:10:25 +00:00
parent bf390c1fbd
commit fad128db86
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=217224
1 changed files with 26 additions and 0 deletions
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26
lib/libthr/thread/thr_stack.c
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@ -30,6 +30,8 @@
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <stdlib.h>
#include <pthread.h>
#include <link.h>
@ -139,6 +141,26 @@ _thr_stack_fix_protection(struct pthread *thrd)
_rtld_get_stack_prot());
}
static void
singlethread_map_stacks_exec(void)
{
int mib[2];
struct rlimit rlim;
u_long usrstack;
size_t len;
mib[0] = CTL_KERN;
mib[1] = KERN_USRSTACK;
len = sizeof(usrstack);
if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), &usrstack, &len, NULL, 0)
== -1)
return;
if (getrlimit(RLIMIT_STACK, &rlim) == -1)
return;
mprotect((void *)(uintptr_t)(usrstack - rlim.rlim_cur),
rlim.rlim_cur, _rtld_get_stack_prot());
}
void __pthread_map_stacks_exec(void);
void
__pthread_map_stacks_exec(void)
@ -146,6 +168,10 @@ __pthread_map_stacks_exec(void)
struct pthread *curthread, *thrd;
struct stack *st;
if (!_thr_is_inited()) {
singlethread_map_stacks_exec();
return;
}
curthread = _get_curthread();
THREAD_LIST_RDLOCK(curthread);
LIST_FOREACH(st, &mstackq, qe)