Postgres-XC源码：Utilities for GTM standby global values

come from ：Postgres-XC source code 1.04

 * standby_utils.c

 * Utilities for GTM standby global values

#include "gtm/gtm_c.h"
#include "gtm/standby_utils.h"
#include "gtm/gtm_lock.h"

/*
* Variables to interact with GTM active under GTM standby mode.
*/
bool GTM_StandbyMode = false;
char *GTM_ActiveAddress;
int GTM_ActivePort;

/* For thread safety, values above are protected by a lock */
static GTM_RWLock StandbyLock;

bool
Recovery_IsStandby(void)
{
bool res;
GTM_RWLockAcquire(&StandbyLock, GTM_LOCKMODE_READ);
res = GTM_StandbyMode;
GTM_RWLockRelease(&StandbyLock);
return res;
}

void
Recovery_StandbySetStandby(bool standby)
{
GTM_RWLockAcquire(&StandbyLock, GTM_LOCKMODE_WRITE);
GTM_StandbyMode = standby;
GTM_RWLockRelease(&StandbyLock);
}

void
Recovery_StandbySetConnInfo(const char *addr, int port)
{
GTM_RWLockAcquire(&StandbyLock, GTM_LOCKMODE_WRITE);
GTM_ActiveAddress = strdup(addr);
GTM_ActivePort = port;
GTM_RWLockRelease(&StandbyLock);
}

int
Recovery_StandbyGetActivePort(void)
{
int res;

GTM_RWLockAcquire(&StandbyLock, GTM_LOCKMODE_READ);
res = GTM_ActivePort;
GTM_RWLockRelease(&StandbyLock);

return res;
}

char *
Recovery_StandbyGetActiveAddress(void)
{
char *res;

GTM_RWLockAcquire(&StandbyLock, GTM_LOCKMODE_READ);
res = GTM_ActiveAddress;
GTM_RWLockRelease(&StandbyLock);

return res;
}

void
Recovery_InitStandbyLock(void)
{
GTM_RWLockInit(&StandbyLock);
}