/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2005-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Description: A lock checker that checks that each thread acquires
* locks according to a predefined global lock order. The
* global lock order is used to prevent deadlocks. If the
* lock order is violated, an error message is printed
* and the emulator aborts. The lock checker is only
* intended to be enabled when debugging.
*
* Author: Rickard Green
*/
#include "sys.h"
#ifndef ERTS_LOCK_CHECK_H__
#define ERTS_LOCK_CHECK_H__
#ifdef ERTS_ENABLE_LOCK_CHECK
#ifndef ERTS_ENABLE_LOCK_POSITION
/* Enable in order for _x variants of mtx functions to be used. */
#define ERTS_ENABLE_LOCK_POSITION 1
#endif
typedef struct {
int inited;
Sint16 id;
Uint16 flags;
UWord extra;
} erts_lc_lock_t;
#define ERTS_LC_INITITALIZED 0x7f7f7f7f
#define ERTS_LC_FLG_LT_SPINLOCK (((Uint16) 1) << 0)
#define ERTS_LC_FLG_LT_RWSPINLOCK (((Uint16) 1) << 1)
#define ERTS_LC_FLG_LT_MUTEX (((Uint16) 1) << 2)
#define ERTS_LC_FLG_LT_RWMUTEX (((Uint16) 1) << 3)
#define ERTS_LC_FLG_LT_PROCLOCK (((Uint16) 1) << 4)
#define ERTS_LC_FLG_LO_READ (((Uint16) 1) << 5)
#define ERTS_LC_FLG_LO_WRITE (((Uint16) 1) << 6)
#define ERTS_LC_FLG_LO_READ_WRITE (ERTS_LC_FLG_LO_READ \
| ERTS_LC_FLG_LO_WRITE)
#define ERTS_LC_FLG_LT_ALL (ERTS_LC_FLG_LT_SPINLOCK \
| ERTS_LC_FLG_LT_RWSPINLOCK \
| ERTS_LC_FLG_LT_MUTEX \
| ERTS_LC_FLG_LT_RWMUTEX \
| ERTS_LC_FLG_LT_PROCLOCK)
#define ERTS_LC_FLG_LO_ALL (ERTS_LC_FLG_LO_READ \
| ERTS_LC_FLG_LO_WRITE)
#define ERTS_LC_LOCK_INIT(ID, X, F) {ERTS_LC_INITITALIZED, (ID), (F), (X)}
void erts_lc_init(void);
void erts_lc_late_init(void);
Sint16 erts_lc_get_lock_order_id(char *name);
void erts_lc_check(erts_lc_lock_t *have, int have_len,
erts_lc_lock_t *have_not, int have_not_len);
void erts_lc_check_exact(erts_lc_lock_t *have, int have_len);
void erts_lc_have_locks(int *resv, erts_lc_lock_t *lcks, int len);
void erts_lc_have_lock_ids(int *resv, int *ids, int len);
void erts_lc_check_no_locked_of_type(Uint16 flags);
int erts_lc_trylock_force_busy_flg(erts_lc_lock_t *lck, Uint16 op_flags);
void erts_lc_trylock_flg_x(int locked, erts_lc_lock_t *lck, Uint16 op_flags,
char *file, unsigned int line);
void erts_lc_lock_flg_x(erts_lc_lock_t *lck, Uint16 op_flags,
char *file, unsigned int line);
void erts_lc_unlock_flg(erts_lc_lock_t *lck, Uint16 op_flags);
void erts_lc_might_unlock_flg(erts_lc_lock_t *lck, Uint16 op_flags);
int erts_lc_trylock_force_busy(erts_lc_lock_t *lck);
void erts_lc_trylock_x(int locked, erts_lc_lock_t *lck,
char* file, unsigned int line);
void erts_lc_lock_x(erts_lc_lock_t *lck, char* file, unsigned int line);
void erts_lc_unlock(erts_lc_lock_t *lck);
void erts_lc_might_unlock(erts_lc_lock_t *lck);
void erts_lc_init_lock(erts_lc_lock_t *lck, char *name, Uint16 flags);
void erts_lc_init_lock_x(erts_lc_lock_t *lck, char *name, Uint16 flags, Eterm extra);
void erts_lc_destroy_lock(erts_lc_lock_t *lck);
void erts_lc_fail(char *fmt, ...);
int erts_lc_assert_failed(char *file, int line, char *assertion);
void erts_lc_set_thread_name(char *thread_name);
void erts_lc_pll(void);
void erts_lc_require_lock_flg(erts_lc_lock_t *lck, Uint16 op_flags,
char *file, unsigned int line);
void erts_lc_unrequire_lock_flg(erts_lc_lock_t *lck, Uint16 op_flags);
void erts_lc_require_lock(erts_lc_lock_t *lck, char *file, unsigned int line);
void erts_lc_unrequire_lock(erts_lc_lock_t *lck);
int erts_lc_is_emu_thr(void);
#define ERTS_LC_ASSERT(A) \
((void) (((A) || ERTS_SOMEONE_IS_CRASH_DUMPING) ? 1 : erts_lc_assert_failed(__FILE__, __LINE__, #A)))
#else /* #ifdef ERTS_ENABLE_LOCK_CHECK */
#define ERTS_LC_ASSERT(A) ((void) 1)
#endif /* #ifdef ERTS_ENABLE_LOCK_CHECK */
#define erts_lc_lock(lck) erts_lc_lock_x(lck,__FILE__,__LINE__)
#define erts_lc_trylock(res,lck) erts_lc_trylock_x(res,lck,__FILE__,__LINE__)
#define erts_lc_lock_flg(lck) erts_lc_lock_flg_x(lck,__FILE__,__LINE__)
#define erts_lc_trylock_flg(res,lck) erts_lc_trylock_flg_x(res,lck,__FILE__,__LINE__)
#endif /* #ifndef ERTS_LOCK_CHECK_H__ */
