kaguya
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#include <stdio.h>
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#include <pthread.h>
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#include <assert.h>
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_Thread_local unsigned int counter = 9999;
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_Thread_local unsigned int uninitialized;
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void *check_counter(void *arg)
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{
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(void)arg;
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fprintf(stderr, "counter for worker thread: %d, at %p\n", counter, &counter);
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fflush(stderr);
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assert(counter == 9999);
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fprintf(stderr, "uninitialized data for worker thread: %d, at %p\n", uninitialized, &uninitialized);
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fflush(stderr);
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assert(uninitialized == 0);
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++counter;
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++uninitialized;
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fprintf(stderr, "counter for worker thread: %d\n", counter);
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fflush(stderr);
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assert(counter == 10000);
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assert(uninitialized == 1);
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return NULL;
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}
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int main()
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{
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fprintf(stderr, "counter for main thread: %d, at %p\n", counter, &counter);
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fflush(stderr);
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assert(counter == 9999);
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fprintf(stderr, "uninitialized data for main thread: %d, at %p\n", uninitialized, &uninitialized);
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fflush(stderr);
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assert(uninitialized == 0);
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++counter;
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++uninitialized;
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fprintf(stderr, "counter for main: %d\n", counter);
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fflush(stderr);
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assert(counter == 10000);
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assert(uninitialized == 1);
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pthread_t thd;
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pthread_create(&thd, NULL, check_counter, NULL);
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pthread_join(thd, NULL);
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fprintf(stderr, "counter for main: %d\n", counter);
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fflush(stderr);
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assert(counter == 10000);
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assert(uninitialized == 1);
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return 0;
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}
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