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Add missing pthread_barrier_t.

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Supply a simple implementation of the missing pthread_barrier_t type and
functions, for macOS.

Discussion: https://postgr.es/m/20200227180100.zyvjwzcpiokfsqm2%40alap3.anarazel.de
This commit is contained in:
Thomas Munro
2021-03-10 15:40:17 +13:00
parent 547f04e734
commit 44bf3d5083
7 changed files with 196 additions and 0 deletions
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3
src/include/pg_config.h.in
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@ -424,6 +424,9 @@
/* Define if you have POSIX threads libraries and header files. */
#undef HAVE_PTHREAD
/* Define to 1 if you have the `pthread_barrier_wait' function. */
#undef HAVE_PTHREAD_BARRIER_WAIT
/* Define to 1 if you have the `pthread_is_threaded_np' function. */
#undef HAVE_PTHREAD_IS_THREADED_NP

41
src/include/port/pg_pthread.h Normal file
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@ -0,0 +1,41 @@
/*-------------------------------------------------------------------------
*
* Declarations for missing POSIX thread components.
*
* Currently this supplies an implementation of pthread_barrier_t for the
* benefit of macOS, which lacks it. These declarations are not in port.h,
* because that'd require <pthread.h> to be included by every translation
* unit.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_PTHREAD_H
#define PG_PTHREAD_H
#include <pthread.h>
#ifndef HAVE_PTHREAD_BARRIER_WAIT
#ifndef PTHREAD_BARRIER_SERIAL_THREAD
#define PTHREAD_BARRIER_SERIAL_THREAD (-1)
#endif
typedef struct pg_pthread_barrier
{
bool sense; /* we only need a one bit phase */
int count; /* number of threads expected */
int arrived; /* number of threads that have arrived */
pthread_mutex_t mutex;
pthread_cond_t cond;
} pthread_barrier_t;
extern int pthread_barrier_init(pthread_barrier_t *barrier,
const void *attr,
int count);
extern int pthread_barrier_wait(pthread_barrier_t *barrier);
extern int pthread_barrier_destroy(pthread_barrier_t *barrier);
#endif
#endif