Concurrency

Parallel computing and synchronization via POSIX Threads. More...

Classes
struct	Condition
	POSIX Threads conditional variables. More...
struct	Lock
	POSIX Threads locks. More...
struct	Operation
	An abstraction for discrete units of work, or tasks. More...
struct	OperationQueue
	OperationQueues provide threads of execution for Operations. More...
struct	Thread
	POSIX Threads. More...

Macros
#define	do_once(once, block)
	Executes the given block at most one time.

Typedefs
typedef long	Once
	The Once type.

Macro Definition Documentation

do_once

#define do_once	(		once,
			block
	)

Value:

    do { \
      Once _pending = 0; \
      if (__atomic_compare_exchange_n(once, &_pending, -1, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED)) { \
        block; __atomic_store_n(once, 1, __ATOMIC_RELEASE); \
      } else { \
        while (__atomic_load_n(once, __ATOMIC_ACQUIRE) != 1) ; \
      } \
    } while (0)

Executes the given block at most one time.

Definition at line 43 of file Once.h.

       { \
      Once _pending = 0; \
      if (__atomic_compare_exchange_n(once, &_pending, -1, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED)) { \
        block; __atomic_store_n(once, 1, __ATOMIC_RELEASE); \
      } else { \
        while (__atomic_load_n(once, __ATOMIC_ACQUIRE) != 1) ; \
      } \
    } while (0)

Typedef Documentation

Once

typedef long Once

The Once type.

Definition at line 37 of file Once.h.