a point of threads to create multiple threads
Code:
#include <pthread.h>
#incldue <stdlib.h>
#include <cstdio.h>
#include <calloc.h>
void *testing(void *threadid)
{
printf("hello");
pthread_exit(NULL);
}
int main()
{
int c=5;
pthread_t *thread1;
thread1 = (pthread_t*)calloc(c, sizeof(pthread_t));
pthread_create(thread1[0], NULL, testing, NULL);
pthread_create(thread1[1], NULL, testing, NULL);
pthread_create(thread1[2], NULL, testing, NULL);
pthread_create(thread1[3], NULL, testing, NULL);
pthread_create(thread1[4], NULL, testing, NULL);
return 0;
int x=0;
for(x; x<c; x++)
{
pthread_join(thread1[t],NULL);
}
return 0;
}
i want to run a user specified number of threads however i get the following errors:
main.cc:9: error: `printf' undeclared (first use this function)
main.cc:9: error: (Each undeclared identifier is reported only once for each
function it appears in.)
main.cc: In function `int main()':
main.cc:18: error: `calloc' undeclared (first use this function)
main.cc:19: error: cannot convert `__pthread_st*' to `__pthread_st**' for
argument `1' to `int pthread_create(__pthread_st**, const pthread_attr_t*,
void*(*)(void*), void*)'
main.cc:20: error: cannot convert `__pthread_st*' to `__pthread_st**' for
argument `1' to `int pthread_create(__pthread_st**, const pthread_attr_t*,
void*(*)(void*), void*)'
main.cc:21: error: cannot convert `__pthread_st*' to `__pthread_st**' for
argument `1' to `int pthread_create(__pthread_st**, const pthread_attr_t*,
void*(*)(void*), void*)'
main.cc:22: error: cannot convert `__pthread_st*' to `__pthread_st**' for
argument `1' to `int pthread_create(__pthread_st**, const pthread_attr_t*,
void*(*)(void*), void*)'
main.cc:23: error: cannot convert `__pthread_st*' to `__pthread_st**' for
argument `1' to `int pthread_create(__pthread_st**, const pthread_attr_t*,
void*(*)(void*), void*)'
main.cc:28: error: `t' undeclared (first use this function)
