include/net-snmp/snmp_locking.h

/* snmp_locking.h - multi-thread resource locking support declarations */
/*
 * Author: Markku Laukkanen
 * Created: 6-Sep-1999
 * History:
 *  8-Sep-1999 M. Slifcak method names changed;
 *                        use array of resource locking structures.
 *  3-Jan-2001 R. Story   copy mt_resource.h to snmp_locking.h
 */

#ifndef SNMP_LOCKING_H
#define SNMP_LOCKING__H

#ifdef __cplusplus
extern "C" {
#endif

#ifdef NS_REENTRANT

#if HAVE_PTHREAD_H

#include <pthread.h>
typedef pthread_mutex_t mutex_type;
#ifdef pthread_mutexattr_default
    #define MT_MUTEX_INIT_DEFAULT pthread_mutexattr_default
#else
    #define MT_MUTEX_INIT_DEFAULT 0
#endif

#elif defined(WIN32) || defined(cygwin)

#include <windows.h>
typedef CRITICAL_SECTION  mutex_type;

#else
  error "There is no re-entrant support as defined."
#endif

int netsnmp_mutex_init(&mutex_type);
int netsnmp_mutex_lock(&mutex_type);
int netsnmp_mutex_unlock(&mutex_type);
int netsnmp_mutex_destroy_mutex(&mutex_type);

#else  /* !NS_REENTRANT */

#define netsnmp_mutex_init(x) do {} while (0)
#define netsnmp_mutex_lock(x) do {} while (0)
#define netsnmp_mutex_unlock(x) do {} while (0)
#define netsnmp_mutex_destroy_mutex(x) do {} while (0)

#endif /* !NS_REENTRANT */

#ifdef __cplusplus
}
#endif

#endif /* SNMP_LOCKING__H */