pthread-win32.c

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/*-------------------------------------------------------------------------
*
* pthread-win32.c
*    partial pthread implementation for win32
*
* Copyright (c) 2004-2024, PostgreSQL Global Development Group
* IDENTIFICATION
*   src/interfaces/libpq/pthread-win32.c
*
*-------------------------------------------------------------------------
*/
 
#include "postgres_fe.h"
 
#include "pthread-win32.h"
 
DWORD
pthread_self(void)
{
    return GetCurrentThreadId();
}
 
void
pthread_setspecific(pthread_key_t key, void *val)
{
}
 
void *
pthread_getspecific(pthread_key_t key)
{
    return NULL;
}
 
int
pthread_mutex_init(pthread_mutex_t *mp, void *attr)
{
    mp->initstate = 0;
    return 0;
}
 
int
pthread_mutex_lock(pthread_mutex_t *mp)
{
    /* Initialize the csection if not already done */
    if (mp->initstate != 1)
    {
        LONG        istate;
 
        while ((istate = InterlockedExchange(&mp->initstate, 2)) == 2)
            Sleep(0);           /* wait, another thread is doing this */
        if (istate != 1)
            InitializeCriticalSection(&mp->csection);
        InterlockedExchange(&mp->initstate, 1);
    }
    EnterCriticalSection(&mp->csection);
    return 0;
}
 
int
pthread_mutex_unlock(pthread_mutex_t *mp)
{
    if (mp->initstate != 1)
        return EINVAL;
    LeaveCriticalSection(&mp->csection);
    return 0;
}