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