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Diffstat (limited to 'src/include/storage/barrier.h')
| -rw-r--r-- | src/include/storage/barrier.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/include/storage/barrier.h b/src/include/storage/barrier.h new file mode 100644 index 0000000..d71927c --- /dev/null +++ b/src/include/storage/barrier.h @@ -0,0 +1,45 @@ +/*------------------------------------------------------------------------- + * + * barrier.h + * Barriers for synchronizing cooperating processes. + * + * Portions Copyright (c) 1996-2020, 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 */ |