43 lines · cpp
1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2 3// The test captures what some high-performance networking servers do.4// One thread writes to an fd, and another just receives an epoll5// notification about the write to synchronize with the first thread6// w/o actually reading from the fd.7 8#include "../test.h"9#include <errno.h>10#include <sys/epoll.h>11#include <sys/eventfd.h>12 13int main() {14 int efd = epoll_create(1);15 if (efd == -1)16 exit(printf("epoll_create failed: %d\n", errno));17 int fd = eventfd(0, 0);18 if (fd == -1)19 exit(printf("eventfd failed: %d\n", errno));20 epoll_event event = {.events = EPOLLIN | EPOLLET};21 if (epoll_ctl(efd, EPOLL_CTL_ADD, fd, &event))22 exit(printf("epoll_ctl failed: %d\n", errno));23 pthread_t th;24 pthread_create(25 &th, nullptr,26 +[](void *arg) -> void * {27 long long to_add = 1;28 if (write((long)arg, &to_add, sizeof(to_add)) != sizeof(to_add))29 exit(printf("write failed: %d\n", errno));30 return nullptr;31 },32 (void *)(long)fd);33 struct epoll_event events[1] = {};34 if (epoll_wait(efd, events, 1, -1) != 1)35 exit(printf("epoll_wait failed: %d\n", errno));36 close(fd);37 pthread_join(th, nullptr);38 close(efd);39 fprintf(stderr, "DONE\n");40}41 42// CHECK: DONE43