50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
// This testcase, when run with large number of threads
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// under stace -f, may never finish because strace does not
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// ensure any fairness in thread scheduling:
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// it restarts threads as they stop. If daughter threads crowd out
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// the "mother" and _they_ get continually restarted by strace,
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// the end of spawning loop will never be reached.
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//
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// Also, it is a testcase which triggers the
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// "strace: Exit of unknown pid 32457 seen"
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// message when on testcase exit, strace sees deaths of newly-attached
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// threads _before_ their first syscall stop.
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//
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#include <stdio.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <stdlib.h>
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static int thd_no;
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static void *sub_thd(void *c)
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{
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dprintf(1, "sub-thread %d created\n", ++thd_no);
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for (;;)
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getuid();
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return NULL;
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}
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int main(int argc, char *argv[])
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{
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int i;
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pthread_t *thd;
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int num_threads = 1;
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if (argv[1])
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num_threads = atoi(argv[1]);
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thd = malloc(num_threads * sizeof(thd[0]));
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dprintf(1, "test start, num_threads:%d...\n", num_threads);
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for (i = 0; i < num_threads; i++) {
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pthread_create(&thd[i], NULL, sub_thd, NULL);
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dprintf(1, "after pthread_create\n");
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}
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/* Exit. This kills all threads */
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return 0;
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}
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