elf.h: add ELFCOMPRESS_ZSTD

[musl] / src / thread / pthread_kill.c

diff --git a/src/thread/pthread_kill.c b/src/thread/pthread_kill.c
index 9d85fa5..79ddb20 100644 (file)
--- a/src/thread/pthread_kill.c
+++ b/src/thread/pthread_kill.c
@@ -1,7 +1,18 @@
-#define SYSCALL_RETURN_ERRNO
 #include "pthread_impl.h"
+#include "lock.h"
 
 int pthread_kill(pthread_t t, int sig)
 {
-       return syscall3(__NR_tgkill, t->pid, t->tid, sig);
+       int r;
+       sigset_t 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);
+       UNLOCK(t->killlock);
+       __restore_sigs(&set);
+       return r;
 }