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/*
* Regression test for stdio locking. If file locking is not enabled the
* threads will race to write the file output buffer and we will see lines
* that are longer or shorter then 100 characters. When locking is
* working/enabled each 100 character line will be printed separately.
*
* See:
* musl/src/stdio/__lockfile.c
* musl/src/stdio/fwrite.c
*/
#include <assert.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
pthread_t thread[2];
char *char_repeat(int n, char c) {
char *dest = malloc(n + 1);
memset(dest, c, n);
dest[n] = '\0';
return dest;
}
void *thread_main(void *arg) {
char *msg = char_repeat(100, 'a');
for (int i = 0; i < 10; ++i)
printf("%s\n", msg);
free(msg);
return 0;
}
int main() {
printf("in main\n");
void *thread_rtn;
int rc;
rc = pthread_create(&thread[0], NULL, thread_main, NULL);
assert(rc == 0);
rc = pthread_create(&thread[1], NULL, thread_main, NULL);
assert(rc == 0);
rc = pthread_join(thread[0], &thread_rtn);
assert(rc == 0);
assert(thread_rtn == 0);
rc = pthread_join(thread[1], &thread_rtn);
assert(rc == 0);
assert(thread_rtn == 0);
printf("main done\n");
return 0;
}
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