爲了編寫這段代碼,我檢查並使用了一些教程,仍然在某處我失敗了,考慮到只有主函數似乎可以工作並且退出代碼0。我的腳步創造了?他們是但不知何故,我沒有把他們連接到我的「工作」功能?PThread基本程序,好奇這個代碼有什麼問題
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <math.h>
struct node { // std linked list node
int value;
int worker;
struct node *next;
};
// pthread_t* w_thread;
int slots = 3; // only 3 threads are allowed to access the list
int availableCheck(){ // check if thread can acces the list
if(slots < 3) return 0;
else return -1;
}
pthread_mutex_t mutp = PTHREAD_MUTEX_INITIALIZER; //condvar mutex
pthread_cond_t condvar = PTHREAD_COND_INITIALIZER; //condvar
void * worker(void *i){
long index = (long)i;
printf(" * I am worker # %lu : \n",pthread_self());
// pthread_mutex_lock(&mutp);
// if(availableCheck() < 0){
// printf(" ^^^ List not available yet... \n");
// pthread_cond_wait(&condvar, &mutp);
printf("* Got data: %lu \n", index);
// pthread_cond_signal(&condvar); //
// pthread_mutex_unlock(&mutp);
return NULL;
// }
}
int main(int argc, char *argv[]){
if (argc != 3){
printf("Programm must be called with \n NR of elements and NR of workers! \n ");
exit(1);
}
int i,listSize,workersSize;
struct node *root;
struct node *iterator;
//prepare list for task
listSize = atoi(argv[1]);
root = malloc(sizeof(struct node));
root->value = rand() % 100;
// printf(">>> %d\n", root->value);
root->worker = 0;
iterator = malloc(sizeof(struct node));
iterator = root;
for(i=1; i<listSize; i++){
iterator->next = malloc(sizeof(struct node));
iterator = iterator->next;
iterator->value = rand() % 100;
iterator->worker = i;
printf("node #%d worker: %d value: %d\n", i, iterator->worker,iterator->value);
}
printf("? List got populated\n");
// Create all threads to parse the link list
int ret;
pthread_t w_thread;
int nrWorkers = atoi(argv[2]);
pthread_t* w_threads = malloc(nrWorkers * sizeof(w_thread));
for(i=0; i<listSize; i++){
int *id = malloc(sizeof(int));
*id = i;
ret = pthread_create (&w_threads[i], NULL, worker, (void *) &id);
if(ret) {
perror("Thread creation fail");
exit(2);
}
}
int j;
for (j = 0; i < nrWorkers; j++){
pthread_join(w_threads[j],NULL);
}
}
詩一些評論功能/變量將要使用/執行,但在這一點上我希望線程
喲如何運行你的程序,以及在控制檯中打印什麼? – pmod
'iterator = root;'爲什麼在malloc'ing之後覆蓋'iterator'? – 2012-11-30 22:37:31
能夠迭代從根開始的列表 –