36 lines
1.0 KiB
C
36 lines
1.0 KiB
C
/*
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* mutex_attr.c
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*
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* Create a mutex using a non-default attributes object,
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* mutex_attr. If the implementation supports the pshared
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* attribute, the mutex is created "process private" so that it
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* could be used to synchronize between threads in separate
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* address spaces. (Note that, to create a "process shared"
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* mutex, the pthread_mutex_t itself must be placed in shared
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* memory that is accessible to all threads using the mutex.)
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*/
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#include <pthread.h>
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#include "errors.h"
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pthread_mutex_t mutex;
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int main (int argc, char *argv[])
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{
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pthread_mutexattr_t mutex_attr;
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int status;
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status = pthread_mutexattr_init (&mutex_attr);
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if (status != 0)
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err_abort (status, "Create attr");
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#ifdef _POSIX_THREAD_PROCESS_SHARED
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status = pthread_mutexattr_setpshared (
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&mutex_attr, PTHREAD_PROCESS_PRIVATE);
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if (status != 0)
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err_abort (status, "Set pshared");
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#endif
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status = pthread_mutex_init (&mutex, &mutex_attr);
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if (status != 0)
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err_abort (status, "Init mutex");
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return 0;
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}
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