[LTP] [PATCH] Synchronization between two processes

[Gui Xiaohua <guixh@cn.fujitsu.com>]

The child-process wait SIGUSR1 which would be sended by parent-process,
if the child-process execute sigtimedwait() after parent-process send 
the signal, it would never receive the SIGUSR1 from parent-process.
I cann't make sure the SIGUSR1 be sended after child-process execute 
sigtimedwait() with 100 percent, and i try my best.

Signed-off-by: Gui Xiaohua <guixh@cn.fujitsu.com>
--- testcases/kernel/containers/pidns/pidns12-old.c	2009-05-14 17:00:20.000000000 +0800
+++ testcases/kernel/containers/pidns/pidns12.c	2009-05-15 15:15:22.000000000 +0800
@@ -109,7 +109,7 @@ int child_fn(void *arg)
 	}
 
 	/* Set timeout for sigtimedwait */
-	timeout.tv_sec = 3;
+	timeout.tv_sec = 10;
 	timeout.tv_nsec = 0;
 
 	/* Set mask to wait for SIGUSR1 signal */
@@ -182,6 +182,9 @@ int main(int argc, char *argv[])
 		cleanup();
 	}
 
+	/*Try best to make sure the SIGUSR1 be sended after child-process execute sigtimedwait*/
+	sleep(5);
+
 	/* Send SIGUSR1 to container init */
 	if (kill(cpid, SIGUSR1) == -1) {
 		tst_resm(TBROK, "parent: kill() failed(%s).", strerror(errno));


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