61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
#include <pthread.h>
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#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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void *increase(void *vargp);
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void *decrease(void *vargp);
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int cnt = 0;
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int main()
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{
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unsigned int niters;
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pthread_t t1, t2;
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niters = 10;
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for (int i = 0; i < 10; i++)
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{
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printf("niters=%d\n", niters);
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for (int j = 0; j < 20; j++)
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{
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pthread_create(&t1, NULL, increase, (void *)niters);
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pthread_create(&t2, NULL, decrease, (void *)niters);
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pthread_join(t1, NULL);
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pthread_join(t2, NULL);
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if (cnt != 0)
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{
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printf("Error! cnt=%d\n", cnt);
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exit(1);
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}
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else
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{
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printf("Correct! cnt=%d\n", cnt);
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}
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}
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niters *= 10;
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}
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exit(0);
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}
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void *increase(void *vargp)
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{
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unsigned i, niters = (unsigned int)vargp;
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for (i = 0; i < niters; i++)
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{
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cnt++;
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}
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return NULL;
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}
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void *decrease(void *vargp)
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{
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unsigned i, niters = (unsigned int)vargp;
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for (i = 0; i < niters; i++)
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{
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cnt--;
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}
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return NULL;
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} |