p99_count Struct Reference

A counter that allows atomic increment and decrement and a wait for the value 0. More...

#include <p99_count.h>

Related Functions
(Note that these are not member functions.)
#define	p99_count_dec(...)   P99_CALL_DEFARG(p99_count_dec, 2, __VA_ARGS__)
	decrement the counter p00_c atomically by p00_hm. More...
#define	p99_count_inc(...)   P99_CALL_DEFARG(p99_count_inc, 2, __VA_ARGS__)
	increment the counter counter atomically by p00_hm. More...
#define	p99_count_inc_conditionally(...)   P99_CALL_DEFARG(p99_count_inc_conditionally, 2, __VA_ARGS__)
	increment the counter p00_c atomically by p00_hm but only if it is not zero before. More...
unsigned	p99_count_value (p99_count volatile *p00_c)
	Obtain the value of counter p00_c atomically. More...
void	p99_count_wait (p99_count volatile *p00_c)
	wait until the p00_c counter falls to 0. More...

Detailed Description

A counter that allows atomic increment and decrement and a wait for the value 0.

This is implemented more or less efficiently according to the features that the platform provides:

• one that uses atomic operations and futexes for signaling
• one that mutexes all access and uses a condition variable for signaling.

Definition at line 42 of file p99_count.h.

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The documentation for this struct was generated from the following file:

• p99_count.h