[英]Passing arguments to pthread_create - invalid conversion from void(*)() to void(*)(void*)
I am writing a small simple program that implements a cyclic executive schedule using pthreads. 我正在编写一个小的简单程序,该程序使用pthreads实现循环执行计划。 I first wrote the program without pthreads and am now trying to correctly pass parameters into pthread_create.
我首先编写了没有pthreads的程序,现在尝试将参数正确地传递到pthread_create中。 I know that the args are:
我知道args是:
int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg); int pthread_create(pthread_t * thread,const pthread_attr_t * attr,void *(* start_routine)(void *),void * arg);
but sending the threads to ttable(the schedule) is giving me difficulty. 但是将线程发送到ttable(日程表)给我带来了困难。 Now that I am using threads I have added the void* x parameter even though I am not using it (is this parameter required?) I have tried leaving the schedule with no parameters and passing NULL in as the last arg of pthread_create as well.
现在,我正在使用线程,即使我没有使用它,我也添加了void * x参数(是否需要此参数?)我尝试不使用任何参数的调度,并将NULL作为pthread_create的最后一个参数传入。 My error is currently: error: invalid conversion from 'void ( * )( )' to 'void ( * )(void*)' [-fpermissive] };
我目前的错误是:错误:从'void(*)()'到'void(*)(void *)'的无效转换[-fpermissive]}; ^
^
Here is the code: 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);
}
}
}
}
}
Start functions for pthread_create
must take exactly one argument of type void *
. pthread_create
启动函数必须恰好带有一个类型为void *
参数。 Yours take zero arguments. 您的参数为零。 Fix them to take a dummy argument of type
void *
and everything should be fine. 修复它们,使其采用类型为
void *
的虚拟参数,一切都应该正常。
Use the following: 使用以下内容:
typedef void* (*ThreadFunc_t) (void *);
ThreadFunc_t ttable[SLOTX][CYCLEX] = {
{one, one, two, two},
{three, three, three, three},
{two, two, one, one},
{burn, two, two, burn},
{three, three, three, three},
{one, one, two, two}
};
... ...
rc = pthread_create(&thread[i], NULL, (ttable[slot][cycle]), (void*)i);
If you use pthread_ctreate, you must follow its interface: int pthread_create(pthread_t*restrict tidp,const pthread_attr_t *restrict_attr,void*(*start_rtn)(void*),void *restrict arg); 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);
I hope this may help you! 希望对您有所帮助!
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