mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-08 08:26:14 +00:00
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/** Initialize several kinds of mutexes and lock each mutex twice.
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* Note: locking a regular mutex twice causes a deadlock.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <unistd.h>
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#include <pthread.h>
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#include "../../config.h"
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static void lock_twice(pthread_mutex_t* const p)
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{
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if (pthread_mutex_trylock(p) != 0)
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fprintf(stderr, "first lock call failed !\n");
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if (pthread_mutex_trylock(p) != 0)
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fprintf(stderr, "second lock call failed !\n");
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if (pthread_mutex_unlock(p) != 0)
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fprintf(stderr, "first unlock call failed !\n");
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if (pthread_mutex_unlock(p) != 0)
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fprintf(stderr, "second unlock call failed !\n");
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}
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int main(int argc, char** argv)
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{
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#if defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
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{
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pthread_mutex_t m = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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fprintf(stderr, "Recursive mutex (statically initialized).\n");
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lock_twice(&m);
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pthread_mutex_destroy(&m);
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}
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#endif
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#if defined(HAVE_PTHREAD_MUTEX_RECURSIVE_NP)
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{
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pthread_mutex_t m;
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pthread_mutexattr_t attr;
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fprintf(stderr, "\nRecursive mutex (initialized via mutex attributes).\n");
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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pthread_mutex_init(&m, &attr);
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pthread_mutexattr_destroy(&attr);
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lock_twice(&m);
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pthread_mutex_destroy(&m);
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}
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#endif
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#if defined(HAVE_PTHREAD_MUTEX_ERRORCHECK_NP)
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{
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pthread_mutex_t m;
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pthread_mutexattr_t attr;
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fprintf(stderr, "\nError checking mutex.\n");
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK_NP);
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pthread_mutex_init(&m, &attr);
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pthread_mutexattr_destroy(&attr);
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lock_twice(&m);
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pthread_mutex_destroy(&m);
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}
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#endif
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{
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pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
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fprintf(stderr, "\nNon-recursive mutex.\n");
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lock_twice(&m);
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}
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fprintf(stderr, "\nDone.\n");
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return 0;
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}
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