26 lines · c
1#include <pthread.h>2#include <string.h>3#include <stdlib.h>4#include <stdio.h>5#include <unistd.h>6 7void *volatile mem;8volatile int len;9 10void *Thread(void *p) {11 while ((p = __atomic_load_n(&mem, __ATOMIC_ACQUIRE)) == 0)12 usleep(100);13 memset(p, 0, len);14 return 0;15}16 17extern "C" void libfunc() {18 pthread_t t;19 pthread_create(&t, 0, Thread, 0);20 len = 10;21 __atomic_store_n(&mem, malloc(len), __ATOMIC_RELEASE);22 pthread_join(t, 0);23 free(mem);24 fprintf(stderr, "OK\n");25}26