atm.h File Reference

#include <grpc/impl/codegen/port_platform.h>

Go to the source code of this file.

Functions
gpr_atm	gpr_atm_no_barrier_clamped_add (gpr_atm *value, gpr_atm delta, gpr_atm min, gpr_atm max)
	This interface provides atomic operations and barriers. More...

Function Documentation

gpr_atm_no_barrier_clamped_add()

gpr_atm gpr_atm_no_barrier_clamped_add	(	gpr_atm *	value,
		gpr_atm	delta,
		gpr_atm	min,
		gpr_atm	max
	)

This interface provides atomic operations and barriers.

It is internal to gpr support code and should not be used outside it.

If an operation with acquire semantics precedes another memory access by the same thread, the operation will precede that other access as seen by other threads.

If an operation with release semantics follows another memory access by the same thread, the operation will follow that other access as seen by other threads.

Routines with "acq" or "full" in the name have acquire semantics. Routines with "rel" or "full" in the name have release semantics. Routines with "no_barrier" in the name have neither acquire not release semantics.

The routines may be implemented as macros.

Atomic operations act on an intergral_type gpr_atm that is guaranteed to be the same size as a pointer. typedef intptr_t gpr_atm;

A memory barrier, providing both acquire and release semantics, but not otherwise acting on memory. void gpr_atm_full_barrier(void);

Atomically return *p, with acquire semantics. gpr_atm gpr_atm_acq_load(gpr_atm *p); gpr_atm gpr_atm_no_barrier_load(gpr_atm *p);

Atomically set *p = value, with release semantics. void gpr_atm_rel_store(gpr_atm *p, gpr_atm value);

Atomically add delta to *p, and return the old value of *p, with the barriers specified. gpr_atm gpr_atm_no_barrier_fetch_add(gpr_atm *p, gpr_atm delta); gpr_atm gpr_atm_full_fetch_add(gpr_atm *p, gpr_atm delta);

Atomically, if *p==o, set *p=n and return non-zero otherwise return 0, with the barriers specified if the operation succeeds. int gpr_atm_no_barrier_cas(gpr_atm *p, gpr_atm o, gpr_atm n); int gpr_atm_acq_cas(gpr_atm *p, gpr_atm o, gpr_atm n); int gpr_atm_rel_cas(gpr_atm *p, gpr_atm o, gpr_atm n); int gpr_atm_full_cas(gpr_atm *p, gpr_atm o, gpr_atm n);

Atomically, set *p=n and return the old value of *p gpr_atm gpr_atm_full_xchg(gpr_atm *p, gpr_atm n); Adds delta to *value, clamping the result to the range specified by min and max. Returns the new value.