From 99b5beba2f6c3f2e206e6200a05519a0ec2dc8db Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Wed, 9 May 2012 14:23:27 -0300
Subject: coroutine: Fix setup of sigaltstack coroutines

Use pthread_kill instead of process-wide kill to invoke the signal
handler used for stack switching. This may fix spurious lock-ups with
this backend, easily triggerable by extending the time window between
kill and sigsuspend.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 coroutine-sigaltstack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'coroutine-sigaltstack.c')

diff --git a/coroutine-sigaltstack.c b/coroutine-sigaltstack.c
index 7ff2d3379e..b2e316cea2 100644
--- a/coroutine-sigaltstack.c
+++ b/coroutine-sigaltstack.c
@@ -226,7 +226,7 @@ static Coroutine *coroutine_new(void)
      * called.
      */
     coTS->tr_called = 0;
-    kill(getpid(), SIGUSR2);
+    pthread_kill(pthread_self(), SIGUSR2);
     sigfillset(&sigs);
     sigdelset(&sigs, SIGUSR2);
     while (!coTS->tr_called) {
-- 
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