标签：第一个 fail RoCE red 初始化 style 互斥锁 共享 init
| 共享标志 | 定义 | 名称 | 描述 |
| 0 | PTHREAD_PROCESS_PRIVATE | 进程内互斥锁 | 仅可当前进程内共享 |
| 1 | PTHREAD_PROCESS_SHARED | 进程间互斥锁 | 多个进程间共享 |
第一个程序代码
#include <stdio.h> #include <pthread.h> #include <unistd.h> #include <sys/mman.h> #include <fcntl.h> #include <string.h> #include <sys/stat.h> int main(int argc, char* argv[]) { char mmap_file_path[512] = { 0 }; getcwd(mmap_file_path, sizeof(mmap_file_path)); strcat(mmap_file_path, "/pthread_shared"); int fd = open(mmap_file_path, O_RDWR | O_CREAT, 0744); if (0 < fd) { //重置文件大小 ftruncate(fd, sizeof(pthread_mutex_t)); pthread_mutex_t* mutex_ptr = (pthread_mutex_t*)mmap(0, sizeof(pthread_mutex_t), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); close(fd); //初始化锁对象 pthread_mutexattr_t attr; pthread_mutexattr_init(&attr); pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED); pthread_mutex_init(mutex_ptr, &attr);int lock_ret = pthread_mutex_lock(mutex_ptr); if (0 == lock_ret) { printf("lock successed\n"); usleep(10 * 1000 * 1000); pthread_mutex_unlock(mutex_ptr); } else { printf("lock failed: %d\n", lock_ret); } } else { printf("open err\n"); } return 0; }
第二个程序代码，特殊的在获取锁对象后不需要初始化，因为在第一个进程内已经初始化了
#include <stdio.h> #include <pthread.h> #include <unistd.h> #include <sys/mman.h> #include <fcntl.h> #include <string.h> int main(int argc, char* argv[]) { char mmap_file_path[512] = { 0 }; getcwd(mmap_file_path, sizeof(mmap_file_path)); strcat(mmap_file_path, "/pthread_shared"); int fd = open(mmap_file_path, O_RDWR | O_CREAT, 0744); if (0 < fd) { pthread_mutex_t* mutex_ptr = (pthread_mutex_t*)mmap(0, sizeof(pthread_mutex_t), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); close(fd);int lock_ret = pthread_mutex_lock(mutex_ptr); if (0 == lock_ret) { printf("lock successed\n"); usleep(10 * 1000 * 1000); pthread_mutex_unlock(mutex_ptr); } else { printf("lock failed: %d\n", lock_ret); } } else { printf("open err\n"); } return 0; }
标签：第一个 fail RoCE red 初始化 style 互斥锁 共享 init
原文地址：https://www.cnblogs.com/tianrks/p/10785577.html
