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-rw-r--r--src/thread/pthread_kill.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/thread/pthread_kill.c b/src/thread/pthread_kill.c
index 446254b6..79ddb209 100644
--- a/src/thread/pthread_kill.c
+++ b/src/thread/pthread_kill.c
@@ -5,7 +5,10 @@ int pthread_kill(pthread_t t, int sig)
{
int r;
sigset_t set;
- __block_app_sigs(&set);
+ /* Block not just app signals, but internal ones too, since
+ * pthread_kill is used to implement pthread_cancel, which
+ * must be async-cancel-safe. */
+ __block_all_sigs(&set);
LOCK(t->killlock);
r = t->tid ? -__syscall(SYS_tkill, t->tid, sig)
: (sig+0U >= _NSIG ? EINVAL : 0);