Help: Initialize pthread_cond_t

jaepi · 09-19-2007, 10:40 PM

Hello there, I've been messing around with threads these days. Currently, I'm having problems with one of my variables of type pthread_cond_t (let's call it variable Z). I made a class (let's say class X) , and you guessed it right, Z was declared in it with private access level. Now the problem here is the initialization of Z. I initialized it with this value - PTHREAD_COND_INITIALIZER. It produces this error - error: expected primary-expression before '{' token.

This is the way I initialized it.

Code:

//constructor
X::X(): Z(PTHREAD_COND_INITIALIZER)  
{
//code here  
}

What do you think is the problem?

Thanks!

kev82 · 09-20-2007, 01:22 AM

PTHREAD_COND_INITIALIZER is #defined as an aggregate. On my platform it is {0x3CB0B1BB, {0}}. There is no constructor for pthread_cond_t that accepts an aggregate.

I unfortunately don't have a very good understanding of how aggregates work, and don't know if it is even possible to write a constructor to accept one (I don't think so though). Even if it was, this would require a modification of pthreads to make your code work (very bad idea!).

Bottom line, use pthread_cond_init() in your constructor.