invalid conversion from ‘void* (*)()’ to ‘void* (*)(void*)’ when using pthread in C++
Hi,
I am using pthread in my main.cpp file and got error in the following code:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
pthread_mutex_t count_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t condition_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t condition_cond = PTHREAD_COND_INITIALIZER;
void *functionCount1();
void *functionCount2();
int count = 0;
#define COUNT_DONE 10
#define COUNT_HALT1 3
#define COUNT_HALT2 6
int main()
{
pthread_t thread1, thread2;
pthread_create( &thread1, NULL, &functionCount1, NULL);
pthread_create( &thread2, NULL, &functionCount2, NULL);
pthread_join( thread1, NULL);
pthread_join( thread2, NULL);
return 0;
}
void *functionCount1()
{
for(;;)
{
pthread_mutex_lock( &condition_mutex );
while( count >= COUNT_HALT1 && count <= COUNT_HALT2 )
{
pthread_cond_wait( &condition_cond, &condition_mutex );
}
pthread_mutex_unlock( &condition_mutex );
pthread_mutex_lock( &count_mutex );
count++;
printf("Counter value functionCount1: %d\n",count);
pthread_mutex_unlock( &count_mutex );
if(count >= COUNT_DONE) return(NULL);
}
}
void *functionCount2()
{
for(;;)
{
pthread_mutex_lock( &condition_mutex );
if( count < COUNT_HALT1 || count > COUNT_HALT2 )
{
pthread_cond_signal( &condition_cond );
}
pthread_mutex_unlock( &condition_mutex );
pthread_mutex_lock( &count_mutex );
count++;
printf("Counter value functionCount2: %d\n",count);
pthread_mutex_unlock( &count_mutex );
if(count >= COUNT_DONE) return(NULL);
}
}
g++ gives error:
Quote:
/home/C/test/main.cpp|96|error: invalid conversion from ‘void* (*)()’ to ‘void* (*)(void*)’|
/home/C/test/main.cpp|96|error: initializing argument 3 of ‘int pthread_create(pthread_t*, const pthread_attr_t*, void* (*)(void*), void*)’|
/home/C/test/main.cpp|97|error: invalid conversion from ‘void* (*)()’ to ‘void* (*)(void*)’|
/home/C/test/main.cpp|97|error: initializing argument 3 of ‘int pthread_create(pthread_t*, const pthread_attr_t*, void* (*)(void*), void*)’|
Could you explain a little bit about these mistakes and how to fix it? Thanks in advance!
