greenplumn barrier 源码
greenplumn barrier 代码
文件路径：/src/include/storage/barrier.h
/*-------------------------------------------------------------------------
*
* barrier.h
* Barriers for synchronizing cooperating processes.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/storage/barrier.h
*
*-------------------------------------------------------------------------
*/
#ifndef BARRIER_H
#define BARRIER_H
/*
* For the header previously known as "barrier.h", please include
* "port/atomics.h", which deals with atomics, compiler barriers and memory
* barriers.
*/
#include "storage/condition_variable.h"
#include "storage/spin.h"
typedef struct Barrier
{
slock_t mutex;
int phase; /* phase counter */
int participants; /* the number of participants attached */
int arrived; /* the number of participants that have
* arrived */
int elected; /* highest phase elected */
bool static_party; /* used only for assertions */
ConditionVariable condition_variable;
} Barrier;
extern void BarrierInit(Barrier *barrier, int num_workers);
extern bool BarrierArriveAndWait(Barrier *barrier, uint32 wait_event_info);
extern bool BarrierArriveAndDetach(Barrier *barrier);
extern int BarrierAttach(Barrier *barrier);
extern bool BarrierDetach(Barrier *barrier);
extern int BarrierPhase(Barrier *barrier);
extern int BarrierParticipants(Barrier *barrier);
#endif /* BARRIER_H */
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