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/* See LICENSE file for copyright and license details. */
#define LIBAXL_CONNECTION_RWLOCK\
volatile _Atomic char nrguard_send;\
volatile _Atomic char nrguard_recv;\
MUTEX exguard_send;\
MUTEX exguard_recv;\
MUTEX exwait_send;\
MUTEX exwait_recv;\
volatile size_t nreaders_send;\
volatile size_t nreaders_recv
#define INIT_LIBAXL_CONNECTION_RWLOCK(CONN)\
do {\
atomic_init(&(CONN)->nrguard_send, 0);\
atomic_init(&(CONN)->nrguard_recv, 0);\
INIT_MUTEX((CONN)->exguard_send);\
INIT_MUTEX((CONN)->exguard_recv);\
INIT_MUTEX((CONN)->exwait_send);\
INIT_MUTEX((CONN)->exwait_recv);\
(CONN)->nreaders_send = 0;\
(CONN)->nreaders_recv = 0;\
} while (0)
#define WLOCK_CONNECTION_(CONN, SUFFIX) _LOCK((CONN)->exguard_##SUFFIX)
#define WTRYLOCK_CONNECTION_(CONN, SUFFIX) _TRYLOCK((CONN)->exguard_##SUFFIX)
#define WUNLOCK_CONNECTION_(CONN, SUFFIX) _UNLOCK((CONN)->exguard_##SUFFIX)
#define RLOCK_CONNECTION_(CONN, SUFFIX)\
do {\
char old_val__;\
do {\
do {\
old_val__ = atomic_fetch_or(&(CONN)->nrguard_##SUFFIX, 1);\
} while (old_val__ == 1);\
if (old_val__ == 0) {\
if (!(CONN)->nreaders_##SUFFIX++) {\
if (WTRYLOCK_CONNECTION_(CONN, SUFFIX)) {\
atomic_store(&(CONN)->nrguard_##SUFFIX, 2);\
} else {\
_LOCK((CONN)->exwait_##SUFFIX);\
atomic_store(&(CONN)->nrguard_##SUFFIX, 2);\
WLOCK_CONNECTION_(CONN, SUFFIX);\
_UNLOCK((CONN)->exwait_##SUFFIX);\
}\
}\
atomic_store(&(CONN)->nrguard_##SUFFIX, 0);\
break;\
} else {\
_WAIT((CONN)->exwait_##SUFFIX);\
}\
} while (old_val__ == 2);\
} while (0)
#define RUNLOCK_CONNECTION_(CONN, SUFFIX)\
do {\
char old_val__;\
do {\
old_val__ = atomic_fetch_or(&(CONN)->nrguard_##SUFFIX, 1);\
} while (old_val__);\
if (!--(CONN)->nreaders_##SUFFIX)\
WUNLOCK_CONNECTION_((CONN), SUFFIX);\
atomic_store(&(CONN)->nrguard_##SUFFIX, 0);\
} while (0)
#define WLOCK_CONNECTION_SEND(CONN) WLOCK_CONNECTION_(CONN, send)
#define WUNLOCK_CONNECTION_SEND(CONN) WUNLOCK_CONNECTION_(CONN, send)
#define RLOCK_CONNECTION_SEND(CONN) RLOCK_CONNECTION_(CONN, send)
#define RUNLOCK_CONNECTION_SEND(CONN) RUNLOCK_CONNECTION_(CONN, send)
#define WLOCK_CONNECTION_RECV(CONN) WLOCK_CONNECTION_(CONN, recv)
#define WUNLOCK_CONNECTION_RECV(CONN) WUNLOCK_CONNECTION_(CONN, recv)
#define RLOCK_CONNECTION_RECV(CONN) RLOCK_CONNECTION_(CONN, recv)
#define RUNLOCK_CONNECTION_RECV(CONN) RUNLOCK_CONNECTION_(CONN, recv)
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