70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
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/*
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* rwlock6.c
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*
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* Check writer and reader locking
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*
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* Depends on API functions:
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* pthread_rwlock_rdlock()
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* pthread_rwlock_wrlock()
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* pthread_rwlock_unlock()
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*/
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#include "test.h"
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static pthread_rwlock_t rwlock1 = PTHREAD_RWLOCK_INITIALIZER;
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static int bankAccount = 0;
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void * wrfunc(void * arg)
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{
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int ba;
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assert(pthread_rwlock_wrlock(&rwlock1) == 0);
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Sleep(2000);
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bankAccount += 10;
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ba = bankAccount;
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assert(pthread_rwlock_unlock(&rwlock1) == 0);
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return ((void *) ba);
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}
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void * rdfunc(void * arg)
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{
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int ba;
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assert(pthread_rwlock_rdlock(&rwlock1) == 0);
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ba = bankAccount;
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assert(pthread_rwlock_unlock(&rwlock1) == 0);
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return ((void *) ba);
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}
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int
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main()
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{
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pthread_t wrt1;
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pthread_t wrt2;
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pthread_t rdt;
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int wr1Result = 0;
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int wr2Result = 0;
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int rdResult = 0;
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bankAccount = 0;
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assert(pthread_create(&wrt1, NULL, wrfunc, NULL) == 0);
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Sleep(500);
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assert(pthread_create(&rdt, NULL, rdfunc, NULL) == 0);
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Sleep(500);
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assert(pthread_create(&wrt2, NULL, wrfunc, NULL) == 0);
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assert(pthread_join(wrt1, (void **) &wr1Result) == 0);
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assert(pthread_join(rdt, (void **) &rdResult) == 0);
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assert(pthread_join(wrt2, (void **) &wr2Result) == 0);
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assert(wr1Result == 10);
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assert(rdResult == 20);
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assert(wr2Result == 20);
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return 0;
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}
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