Demo/Demo_Linux_semaphore
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[修改] 测试

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This commit is contained in:
gaoyang3513
2023-07-11 20:28:43 +08:00
parent 649283de15
commit 81f70e003a
2 changed files with 14 additions and 11 deletions
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4
ReadMe.md
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@ -6,4 +6,6 @@
```shell ```shell
# Top # Top
cmake -S . -B output -G "Unix Makefiles" cmake -S . -B output -G "Unix Makefiles"
```
make -C output
```

21
test_sem.c
View File

@ -12,10 +12,10 @@
int main(){ int main(){
int pid1,pid2; int pid1,pid2;
sem_t *resource1; sem_t *resource1;
sem_t *resource2; sem_t *resource2;
char inpipe[200],outpipe1[100],outpipe2[100]; char inpipe[200],outpipe1[100],outpipe2[100];
int fd[2]; //0为读出段,1为写入端 int fd[2]; //0为读出段,1为写入端
pipe(fd); //建立一个无名管道 pipe(fd); //建立一个无名管道
pid1 = fork(); pid1 = fork();
@ -32,11 +32,12 @@ int main(){
sprintf(outpipe1,"Child process 1 is sending a message!\n"); sprintf(outpipe1,"Child process 1 is sending a message!\n");
write(fd[1],outpipe1, strlen(outpipe1)); write(fd[1],outpipe1, strlen(outpipe1));
lockf(fd[1],0,0); // 管道解锁 lockf(fd[1],0,0); // 管道解锁
sem_post(resource1); // 信号量开锁，name_sem1 sem_post(resource1); // 信号量开锁，name_sem1
sem_close(resource1); // 有名信号量关闭，name_sem1 sem_close(resource1); // 有名信号量关闭，name_sem1
exit(0); // 线程退出
exit(0); // 线程退出
} }
pid2 = fork(); pid2 = fork();
if(pid2<0){ if(pid2<0){
printf("error in the second fork!\n"); printf("error in the second fork!\n");
@ -48,11 +49,11 @@ int main(){
sem_wait(resource1); sem_wait(resource1);
printf("Pid of PID[2]: %u\n", getpid()); printf("Pid of PID[2]: %u\n", getpid());
close(fd[0]); close(fd[0]);
lockf(fd[1],1,0); lockf(fd[1],1,0);
sprintf(outpipe2,"Child process 2 is sending a message!\n"); sprintf(outpipe2,"Child process 2 is sending a message!\n");
write(fd[1],outpipe2, strlen(outpipe2)); write(fd[1],outpipe2, strlen(outpipe2));
lockf(fd[1],0,0); lockf(fd[1],0,0);
sem_post(resource2); sem_post(resource2);
sem_close(resource1); sem_close(resource1);
sem_close(resource2); sem_close(resource2);