passing arg 3 of `pthread_create' from incompatible pointer type

wallwaters · 05-27-2005, 12:01 PM

passing arg 3 of `pthread_create' from incompatible pointer type

I do not understand this warning.

Following is my code . what is that warning. I dont see any thing wrong in code. Please help me.

Result vSend(int rxLength);
void *sendThread(void *rxLength);

void main()
{
vSend(100);
}
Result vSend(int rxLength)
{
Result status = PENDING;
pthread_t sendThread;
int tRetVal;
App_Report("vSend %d",rxLength);
tRetVal = pthread_create( &sendThread, NULL, &sendThread, &rxLength);
return status;
}

void *sendThread(void *rxLength)
{
int *length = (int *) rxLength;
print("Length %d"length );
return NULL;
}

passing arg 3 of `pthread_create' from incompatible pointer type

Thanks
Suneel

freegianghu · 05-27-2005, 12:47 PM

Quote:

Originally posted by wallwaters
passing arg 3 of `pthread_create' from incompatible pointer type

I do not understand this warning.

Following is my code . what is that warning. I dont see any thing wrong in code. Please help me.

Result vSend(int rxLength);
void *sendThread(void *rxLength); // change to void sendThread(void *rxLength);

void main()
{
vSend(100);
}
Result vSend(int rxLength)
{
Result status = PENDING;
pthread_t sendThread;
int tRetVal;
App_Report("vSend %d",rxLength);
tRetVal = pthread_create( &sendThread, NULL, &sendThread, &rxLength);
return status;
}

void *sendThread(void *rxLength) // change to void sendThread(void *rxLength);
{
int *length = (int *) rxLength;
print("Length %d"length );
return NULL;
}

passing arg 3 of `pthread_create' from incompatible pointer type

Thanks
Suneel

rjlee · 06-02-2005, 04:23 PM

freegianghu, you can't return NULL; from a function with a void return-type.

The problem is that sendThread is defined both as a function (by a forward declaration) and as a variable. The variable masks the definition of the function, and so both sendThread arguments passed to pthread_create are of type pthread_t.

Since the third argument to pthread_create is supposed to be a callback function, not a pthread_t, this won't compile.

freegianghu · 06-02-2005, 09:58 PM

Quote:

Originally posted by rjlee
freegianghu, you can't return NULL; from a function with a void return-type.

The problem is that sendThread is defined both as a function (by a forward declaration) and as a variable. The variable masks the definition of the function, and so both sendThread arguments passed to pthread_create are of type pthread_t.

Since the third argument to pthread_create is supposed to be a callback function, not a pthread_t, this won't compile.

Sorry, I made a mistake

. Its should be void *sendThread(void *rxLength)

Have a nice day,
Giang Hu