78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
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/* Compiler options:
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#progos: linux
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#cc: additional_flags=-pthread
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#output: abbb ok\n
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Testing a signal handler corner case. */
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <signal.h>
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#include <pthread.h>
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static void *
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process (void *arg)
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{
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write (2, "a", 1);
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write (2, "b", 1);
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write (2, "b", 1);
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write (2, "b", 1);
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return NULL;
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}
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int ok = 0;
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volatile int done = 0;
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void
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sigusr1 (int signum)
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{
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if (signum != SIGUSR1 || !ok)
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abort ();
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done = 1;
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}
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int
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main (void)
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{
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int retcode;
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pthread_t th_a;
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void *retval;
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sigset_t sigs;
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if (sigemptyset (&sigs) != 0)
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abort ();
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retcode = pthread_create (&th_a, NULL, process, NULL);
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if (retcode != 0)
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abort ();
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if (signal (SIGUSR1, sigusr1) != SIG_DFL)
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abort ();
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if (pthread_sigmask (SIG_BLOCK, NULL, &sigs) != 0
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|| sigaddset (&sigs, SIGUSR1) != 0
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|| pthread_sigmask (SIG_BLOCK, &sigs, NULL) != 0)
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abort ();
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if (pthread_kill (pthread_self (), SIGUSR1) != 0
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|| sched_yield () != 0
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|| sched_yield () != 0
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|| sched_yield () != 0)
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abort ();
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ok = 1;
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if (pthread_sigmask (SIG_UNBLOCK, NULL, &sigs) != 0
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|| sigaddset (&sigs, SIGUSR1) != 0
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|| pthread_sigmask (SIG_UNBLOCK, &sigs, NULL) != 0)
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abort ();
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if (!done)
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abort ();
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retcode = pthread_join (th_a, &retval);
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if (retcode != 0)
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abort ();
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fprintf (stderr, " ok\n");
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return 0;
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}
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