Can';找不到错误C
我得写两条线。每个人打印5个从1到100的偶数/奇数,如下所示(在法语中,奇数是Can';找不到错误C,c,multithreading,ipc,mutex,semaphore,C,Multithreading,Ipc,Mutex,Semaphore,我得写两条线。每个人打印5个从1到100的偶数/奇数,如下所示(在法语中,奇数是1,偶数是对) 我写了这段代码: #include <stdio.h> #include <semaphore.h> #include <pthread.h> #define maxi 100 pthread_mutex_t mutex; sem_t p; sem_t imp; int tour = 0; void *pair(void *arg); void *impair
1
,偶数是对
)
我写了这段代码:
#include <stdio.h>
#include <semaphore.h>
#include <pthread.h>
#define maxi 100
pthread_mutex_t mutex;
sem_t p;
sem_t imp;
int tour = 0;
void *pair(void *arg);
void *impair(void *arg);
int main() {
pthread_t tidp, tidimp;
pthread_mutex_init(&mutex, NULL);
sem_init(&p, 0, 1);
sem_init(&imp, 0, 1);
pthread_create(&tidp, NULL, pair, (void *)2);
pthread_create(&tidimp, NULL, impair, (void *)1);
pthread_join(tidp, NULL);
pthread_join(tidp, NULL);
sem_destroy(&imp);
sem_destroy(&p);
pthread_mutex_destroy(&mutex);
return 0;
}
void *pair(void *arg) {
int i = (int)arg;
int j, l;
// sleep(5);
pthread_mutex_lock(&mutex);
if (!tour) {
tour = 1;
pthread_mutex_unlock(&mutex);
sem_wait(&imp);
} else {
pthread_mutex_unlock(&mutex);
}
for (l = 0; l < maxi; l += 10) {
sem_wait(&p);
printf(" Pair ");
pthread_mutex_lock(&mutex);
for (j = 0; j < 10; j += 2) {
printf(" %4d \t", j + i);
}
pthread_mutex_unlock(&mutex);
printf("\n");
sem_post(&imp);
i += 10;
}
pthread_exit(NULL);
}
void *impair(void *arg) {
int i = (int)arg;
int j, l;
pthread_mutex_lock(&mutex);
if (!tour) {
tour = 1;
pthread_mutex_unlock(&mutex);
sem_wait(&p);
} else {
pthread_mutex_unlock(&mutex);
}
for (l = 0; l < maxi; l += 10) {
sem_wait(&imp);
printf("Impair ");
pthread_mutex_lock(&mutex);
for (j = 0; j < 10; j += 2) {
printf(" %4d \t", j + i);
}
pthread_mutex_unlock(&mutex);
printf("\n");
sem_post(&p);
i += 10;
}
pthread_exit(NULL);
}
#包括
#包括
#包括
#定义最大值100
pthread_mutex_t mutex;
扫描电镜;
sem_t imp;
int-tour=0;
void*对(void*arg);
无效*损害(无效*arg);
int main(){
pthread_t tidp,tidimp;
pthread_mutex_init(&mutex,NULL);
sem_-init(p,0,1);
sem_init(&imp,0,1);
pthread_创建(&tidp,NULL,pair,(void*)2);
pthread_create(&tidimp,NULL,different,(void*)1);
pthread_join(tidp,NULL);
pthread_join(tidp,NULL);
sem_破坏(和imp);
扫描电镜(sem&p);
pthread_mutex_destroy(&mutex);
返回0;
}
空*对(空*参数){
int i=(int)arg;
int j,l;
//睡眠(5);
pthread_mutex_lock(&mutex);
如果(!巡回){
旅游=1;
pthread_mutex_unlock(&mutex);
sem_wait(&imp);
}否则{
pthread_mutex_unlock(&mutex);
}
对于(l=0;l
我不明白的是,当我运行代码时,有时它以奇数开始,有时以偶数开始。更具体地说,当它以奇数开始时,一切正常,我得到从1到100的所有数字,但当它以偶数开始时,有时我只得到91,有时93,有时97
谁能告诉我怎么了?下面的截图可能会有所帮助
您没有等待两个线程退出:
pthread_join(tidp, NULL);
pthread_join(tidp, NULL);
其中一个应该是tidimp
Cal Norum谢谢谢谢你谢谢你让我开心。有时候只需要第二双眼睛。
pthread_join(tidp, NULL);
pthread_join(tidp, NULL);