1/*-------------------------------------------------------------------------
2 *
3 * barrier.h
4 * Barriers for synchronizing cooperating processes.
5 *
6 * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 * src/include/storage/barrier.h
10 *
11 *-------------------------------------------------------------------------
12 */
13#ifndef BARRIER_H
14#define BARRIER_H
15
16/*
17 * For the header previously known as "barrier.h", please include
18 * "port/atomics.h", which deals with atomics, compiler barriers and memory
19 * barriers.
20 */
21
22#include "storage/condition_variable.h"
23#include "storage/spin.h"
24
25typedef struct Barrier
26{
27 slock_t mutex;
28 int phase; /* phase counter */
29 int participants; /* the number of participants attached */
30 int arrived; /* the number of participants that have
31 * arrived */
32 int elected; /* highest phase elected */
33 bool static_party; /* used only for assertions */
34 ConditionVariable condition_variable;
35} Barrier;
36
37extern void BarrierInit(Barrier *barrier, int num_workers);
38extern bool BarrierArriveAndWait(Barrier *barrier, uint32 wait_event_info);
39extern bool BarrierArriveAndDetach(Barrier *barrier);
40extern int BarrierAttach(Barrier *barrier);
41extern bool BarrierDetach(Barrier *barrier);
42extern int BarrierPhase(Barrier *barrier);
43extern int BarrierParticipants(Barrier *barrier);
44
45#endif /* BARRIER_H */
46