qthread_incr - Man Page

#include <qthread.h>

aligned_t
qthread_incr (aligned_t *operand, int incr);

float
qthread_fincr (float *operand, float incr);

double
qthread_dincr (double *operand, double incr);

This function atomically increments the variable pointed to by operand by incr. In short, this is a thread-safe version of:

This function uses architecture-specific assembly to achieve this, but on unrecognized hardware will fall back to using qthread_lock() and qthread_unlock() to be thread-safe. Ordinarily, however, it does not use any of the available address locking mechanisms. There are exceptions. On 32-bit PowerPC, which has 64-bit doubles but does not have a 64-bit atomic load-and-reserve-word instruction. On this architecture we're forced to use qthread_lock() and qthread_unlock().

These functions will return the value *operand had before the increment was performed.

qthread_cas(3)

qthread_cas(3).