我正在编写一个使用pthread实现循环执行计划的小型简单程序 . 我首先编写没有pthreads的程序,现在我正在尝试将参数正确传递给pthread_create . 我知道args是:
int pthread_create(pthread_t * thread,const pthread_attr_t * attr,void ( start_routine)(void *),void * arg);
但是将线程发送到ttable(时间表)给我带来了困难 . 既然我正在使用线程,我已经添加了void * x参数,即使我没有使用它(是否需要此参数?)我已经尝试不使用参数保留计划并将ptread_create作为最后一个arg传递给NULL . 我的错误是:错误:从'void()()'到'void()(void *)'[-fpermissive]}的无效转换; ^
这是代码:
#include <ctype.h>
#include <unistd.h>
#include <sys/times.h>
#include <pthread.h>
#define SLOTX 6
#define CYCLEX 4
#define SLOT_T 1000 //1 second slot time
#define NUM_THREADS 3
int tps;
int i;
int j;
int rc;
int cycle = 0;
int slot = 0;
struct tms n;
void one(void* x){
printf("Task 1 running\n");
sleep(1);
}
void two(void* x){
printf("Task 2 running\n");
sleep(1);
}
void three(void* x){
printf("Task 3 running\n");
sleep(1);
}
void burn(void* x){
printf("Burn cycle\n");
sleep(1);
}
void (*ttable[SLOTX][CYCLEX])(void* x) = {
{one, one, two, two},
{three, three, three, three},
{two, two, one, one},
{burn, two, two, burn},
{three, three, three, three},
{one, one, two, two}
};
main(){
tps = sysconf(_SC_CLK_TCK);
pthread_t thread[NUM_THREADS];
printf("clock ticks/sec = %d\n\n", tps);
while(1){
printf("Starting new hyperperiod\n");
for(slot = 0; slot<SLOTX; slot++){
printf("Starting new frame\n");
for(cycle = 0; cycle<CYCLEX; cycle++){
for(i = 0; i<NUM_THREADS; i++){
rc = pthread_create(&thread[i], NULL, (*ttable[slot][cycle]), *(void*)j);
}
}
}
}
}
2 回答
pthread_create
的启动函数必须只使用一个void *
类型的参数 . 你的零参数 . 修复它们以获取void *
类型的伪参数,一切都应该没问题 .使用以下内容:
...
如果使用pthread_ctreate,则必须遵循其接口:int pthread_create(pthread_t * restrict tidp,const pthread_attr_t * restrict_attr,void ( start_rtn)(void *),void * restrict arg);
我希望这可以帮到你!