OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

libgcc: block signals when releasing split-stack memory 

* generic-morestack-thread.c (free_segments): Block signals during
	thread exit.
This commit is contained in:
Ian Lance Taylor 2020-12-08 10:17:16 -08:00
parent c0ed52d3e0
commit f41dd93ade
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
libgcc/generic-morestack-thread.c
View File

@ -38,6 +38,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#ifndef inhibit_libc
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include "generic-morestack.h"
@ -54,6 +55,9 @@ extern int pthread_key_create (pthread_key_t *, void (*) (void *))
extern int pthread_setspecific (pthread_key_t, const void *)
__attribute__ ((weak));
extern int pthread_sigmask (int, const sigset_t *, sigset_t *)
__attribute__ ((weak));
/* The key for the list of stack segments to free when the thread
exits. This is created by pthread_key_create. */
@ -70,6 +74,16 @@ static pthread_once_t create_key_once = PTHREAD_ONCE_INIT;
static void
free_segments (void* arg)
{
/* We must block signals in case the signal handler tries to split
the stack. We leave them blocked while the thread exits. */
if (pthread_sigmask)
{
sigset_t mask;
sigfillset (&mask);
pthread_sigmask (SIG_BLOCK, &mask, NULL);
}
__morestack_release_segments ((struct stack_segment **) arg, 1);
}