mirror of https://github.com/flysand7/ciabatta.git
28 lines
596 B
C
28 lines
596 B
C
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#include <stdio.h>
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#include <threads.h>
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#include <stdatomic.h>
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atomic_int acnt;
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int cnt;
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int f(void* thr_data)
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{
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for(int n = 0; n < 1000; ++n) {
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atomic_fetch_add_explicit(&acnt, 1, memory_order_relaxed); // atomic
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++cnt; // undefined behavior, in practice some updates missed
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}
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return 0;
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}
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int main(void)
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{
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thrd_t thr[10];
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for(int n = 0; n < 10; ++n)
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thrd_create(&thr[n], f, NULL);
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for(int n = 0; n < 10; ++n)
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thrd_join(thr[n], NULL);
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printf("The atomic counter is %d\n", acnt);
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printf("The non-atomic counter is %d\n", cnt);
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}
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