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mariadb/innobase/sync/sync0rw.c
jani@hynda.mysql.fi d0e8306203 Added xml patch to mysqldump. 
Made innodb to compile more cleanly with debugging options
enabled. Fixed a few bugs and found a few possible bugs, which
I hope Heikki will check. Comments needs to be fixed too. Some
while() functions should be changed to do ... until for documenting
purposes, because some of them must and will be processed at least
once, or a variable would be used uninitialized.

Regards,
Jani
2001-11-05 23:48:03 +02:00

890 lines
22 KiB
C
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/******************************************************
The read-write lock (for thread synchronization)
(c) 1995 Innobase Oy
Created 9/11/1995 Heikki Tuuri
*******************************************************/
#include "sync0rw.h"
#ifdef UNIV_NONINL
#include "sync0rw.ic"
#endif
#include "os0thread.h"
#include "mem0mem.h"
#include "srv0srv.h"
ulint rw_s_system_call_count = 0;
ulint rw_s_spin_wait_count = 0;
ulint rw_s_os_wait_count = 0;
ulint rw_s_exit_count = 0;
ulint rw_x_system_call_count = 0;
ulint rw_x_spin_wait_count = 0;
ulint rw_x_os_wait_count = 0;
ulint rw_x_exit_count = 0;
/* The global list of rw-locks */
rw_lock_list_t rw_lock_list;
mutex_t rw_lock_list_mutex;
/* The global mutex which protects debug info lists of all rw-locks.
To modify the debug info list of an rw-lock, this mutex has to be
acquired in addition to the mutex protecting the lock. */
mutex_t rw_lock_debug_mutex;
os_event_t rw_lock_debug_event; /* If deadlock detection does not
get immediately the mutex, it may
wait for this event */
ibool rw_lock_debug_waiters; /* This is set to TRUE, if there may
be waiters for the event */
/**********************************************************************
Creates a debug info struct. */
static
rw_lock_debug_t*
rw_lock_debug_create(void);
/*======================*/
/**********************************************************************
Frees a debug info struct. */
static
void
rw_lock_debug_free(
/*===============*/
rw_lock_debug_t* info);
/**********************************************************************
Creates a debug info struct. */
static
rw_lock_debug_t*
rw_lock_debug_create(void)
/*======================*/
{
return((rw_lock_debug_t*) mem_alloc(sizeof(rw_lock_debug_t)));
}
/**********************************************************************
Frees a debug info struct. */
static
void
rw_lock_debug_free(
/*===============*/
rw_lock_debug_t* info)
{
mem_free(info);
}
/**********************************************************************
Creates, or rather, initializes an rw-lock object in a specified memory
location (which must be appropriately aligned). The rw-lock is initialized
to the non-locked state. Explicit freeing of the rw-lock with rw_lock_free
is necessary only if the memory block containing it is freed. */
void
rw_lock_create_func(
/*================*/
rw_lock_t* lock, /* in: pointer to memory */
char* cfile_name, /* in: file name where created */
ulint cline) /* in: file line where created */
{
/* If this is the very first time a synchronization
object is created, then the following call initializes
the sync system. */
mutex_create(rw_lock_get_mutex(lock));
mutex_set_level(rw_lock_get_mutex(lock), SYNC_NO_ORDER_CHECK);
lock->mutex.cfile_name = cfile_name;
lock->mutex.cline = cline;
rw_lock_set_waiters(lock, 0);
rw_lock_set_writer(lock, RW_LOCK_NOT_LOCKED);
lock->writer_count = 0;
rw_lock_set_reader_count(lock, 0);
lock->writer_is_wait_ex = FALSE;
UT_LIST_INIT(lock->debug_list);
lock->magic_n = RW_LOCK_MAGIC_N;
lock->level = SYNC_LEVEL_NONE;
lock->cfile_name = cfile_name;
lock->cline = cline;
lock->last_s_file_name = (char *) "not yet reserved";
lock->last_x_file_name = (char *) "not yet reserved";
lock->last_s_line = 0;
lock->last_x_line = 0;
mutex_enter(&rw_lock_list_mutex);
UT_LIST_ADD_FIRST(list, rw_lock_list, lock);
mutex_exit(&rw_lock_list_mutex);
}
/**********************************************************************
Calling this function is obligatory only if the memory buffer containing
the rw-lock is freed. Removes an rw-lock object from the global list. The
rw-lock is checked to be in the non-locked state. */
void
rw_lock_free(
/*=========*/
rw_lock_t* lock) /* in: rw-lock */
{
ut_ad(rw_lock_validate(lock));
ut_a(rw_lock_get_writer(lock) == RW_LOCK_NOT_LOCKED);
ut_a(rw_lock_get_waiters(lock) == 0);
ut_a(rw_lock_get_reader_count(lock) == 0);
lock->magic_n = 0;
mutex_free(rw_lock_get_mutex(lock));
mutex_enter(&rw_lock_list_mutex);
UT_LIST_REMOVE(list, rw_lock_list, lock);
mutex_exit(&rw_lock_list_mutex);
}
/**********************************************************************
Checks that the rw-lock has been initialized and that there are no
simultaneous shared and exclusive locks. */
ibool
rw_lock_validate(
/*=============*/
rw_lock_t* lock)
{
ut_a(lock);
mutex_enter(rw_lock_get_mutex(lock));
ut_a(lock->magic_n == RW_LOCK_MAGIC_N);
ut_a((rw_lock_get_reader_count(lock) == 0)
|| (rw_lock_get_writer(lock) != RW_LOCK_EX));
ut_a((rw_lock_get_writer(lock) == RW_LOCK_EX)
|| (rw_lock_get_writer(lock) == RW_LOCK_WAIT_EX)
|| (rw_lock_get_writer(lock) == RW_LOCK_NOT_LOCKED));
ut_a((rw_lock_get_waiters(lock) == 0)
|| (rw_lock_get_waiters(lock) == 1));
ut_a((lock->writer != RW_LOCK_EX) || (lock->writer_count > 0));
mutex_exit(rw_lock_get_mutex(lock));
return(TRUE);
}
/**********************************************************************
Lock an rw-lock in shared mode for the current thread. If the rw-lock is
locked in exclusive mode, or there is an exclusive lock request waiting,
the function spins a preset time (controlled by SYNC_SPIN_ROUNDS), waiting
for the lock, before suspending the thread. */
void
rw_lock_s_lock_spin(
/*================*/
rw_lock_t* lock, /* in: pointer to rw-lock */
ulint pass, /* in: pass value; != 0, if the lock
will be passed to another thread to unlock */
char* file_name, /* in: file name where lock requested */
ulint line) /* in: line where requested */
{
ulint index; /* index of the reserved wait cell */
ulint i; /* spin round count */
ut_ad(rw_lock_validate(lock));
lock_loop:
rw_s_spin_wait_count++;
/* Spin waiting for the writer field to become free */
i = 0;
while (rw_lock_get_writer(lock) != RW_LOCK_NOT_LOCKED
&& i < SYNC_SPIN_ROUNDS) {
if (srv_spin_wait_delay) {
ut_delay(ut_rnd_interval(0, srv_spin_wait_delay));
}
i++;
}
if (i == SYNC_SPIN_ROUNDS) {
os_thread_yield();
}
if (srv_print_latch_waits) {
printf(
"Thread %lu spin wait rw-s-lock at %lx cfile %s cline %lu rnds %lu\n",
os_thread_get_curr_id(), (ulint)lock,
lock->cfile_name, lock->cline, i);
}
mutex_enter(rw_lock_get_mutex(lock));
/* We try once again to obtain the lock */
if (TRUE == rw_lock_s_lock_low(lock, pass, file_name, line)) {
mutex_exit(rw_lock_get_mutex(lock));
return; /* Success */
} else {
/* If we get here, locking did not succeed, we may
suspend the thread to wait in the wait array */
rw_s_system_call_count++;
sync_array_reserve_cell(sync_primary_wait_array,
lock, RW_LOCK_SHARED,
file_name, line,
&index);
rw_lock_set_waiters(lock, 1);
mutex_exit(rw_lock_get_mutex(lock));
if (srv_print_latch_waits) {
printf(
"Thread %lu OS wait rw-s-lock at %lx cfile %s cline %lu\n",
os_thread_get_curr_id(), (ulint)lock,
lock->cfile_name, lock->cline);
}
rw_s_system_call_count++;
rw_s_os_wait_count++;
sync_array_wait_event(sync_primary_wait_array, index);
goto lock_loop;
}
}
/**********************************************************************
This function is used in the insert buffer to move the ownership of an
x-latch on a buffer frame to the current thread. The x-latch was set by
the buffer read operation and it protected the buffer frame while the
read was done. The ownership is moved because we want that the current
thread is able to acquire a second x-latch which is stored in an mtr.
This, in turn, is needed to pass the debug checks of index page
operations. */
void
rw_lock_x_lock_move_ownership(
/*==========================*/
rw_lock_t* lock) /* in: lock which was x-locked in the
buffer read */
{
ut_ad(rw_lock_is_locked(lock, RW_LOCK_EX));
mutex_enter(&(lock->mutex));
lock->writer_thread = os_thread_get_curr_id();
lock->pass = 0;
mutex_exit(&(lock->mutex));
}
/**********************************************************************
Low-level function for acquiring an exclusive lock. */
UNIV_INLINE
ulint
rw_lock_x_lock_low(
/*===============*/
/* out: RW_LOCK_NOT_LOCKED if did
not succeed, RW_LOCK_EX if success,
RW_LOCK_WAIT_EX, if got wait reservation */
rw_lock_t* lock, /* in: pointer to rw-lock */
ulint pass, /* in: pass value; != 0, if the lock will
be passed to another thread to unlock */
char* file_name,/* in: file name where lock requested */
ulint line) /* in: line where requested */
{
ut_ad(mutex_own(rw_lock_get_mutex(lock)));
if (rw_lock_get_writer(lock) == RW_LOCK_NOT_LOCKED) {
if (rw_lock_get_reader_count(lock) == 0) {
rw_lock_set_writer(lock, RW_LOCK_EX);
lock->writer_thread = os_thread_get_curr_id();
lock->writer_count++;
lock->pass = pass;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, pass, RW_LOCK_EX,
file_name, line);
#endif
lock->last_x_file_name = file_name;
lock->last_x_line = line;
/* Locking succeeded, we may return */
return(RW_LOCK_EX);
} else {
/* There are readers, we have to wait */
rw_lock_set_writer(lock, RW_LOCK_WAIT_EX);
lock->writer_thread = os_thread_get_curr_id();
lock->pass = pass;
lock->writer_is_wait_ex = TRUE;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, pass, RW_LOCK_WAIT_EX,
file_name, line);
#endif
return(RW_LOCK_WAIT_EX);
}
} else if ((rw_lock_get_writer(lock) == RW_LOCK_WAIT_EX)
&& (lock->writer_thread == os_thread_get_curr_id())) {
if (rw_lock_get_reader_count(lock) == 0) {
rw_lock_set_writer(lock, RW_LOCK_EX);
lock->writer_count++;
lock->pass = pass;
lock->writer_is_wait_ex = FALSE;
#ifdef UNIV_SYNC_DEBUG
rw_lock_remove_debug_info(lock, pass, RW_LOCK_WAIT_EX);
rw_lock_add_debug_info(lock, pass, RW_LOCK_EX,
file_name, line);
#endif
lock->last_x_file_name = file_name;
lock->last_x_line = line;
/* Locking succeeded, we may return */
return(RW_LOCK_EX);
}
return(RW_LOCK_WAIT_EX);
} else if ((rw_lock_get_writer(lock) == RW_LOCK_EX)
&& (lock->writer_thread == os_thread_get_curr_id())
&& (lock->pass == 0)
&& (pass == 0)) {
lock->writer_count++;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, pass, RW_LOCK_EX, file_name,
line);
#endif
lock->last_x_file_name = file_name;
lock->last_x_line = line;
/* Locking succeeded, we may return */
return(RW_LOCK_EX);
}
/* Locking did not succeed */
return(RW_LOCK_NOT_LOCKED);
}
/**********************************************************************
NOTE! Use the corresponding macro, not directly this function! Lock an
rw-lock in exclusive mode for the current thread. If the rw-lock is locked
in shared or exclusive mode, or there is an exclusive lock request waiting,
the function spins a preset time (controlled by SYNC_SPIN_ROUNDS), waiting
for the lock before suspending the thread. If the same thread has an x-lock
on the rw-lock, locking succeed, with the following exception: if pass != 0,
only a single x-lock may be taken on the lock. NOTE: If the same thread has
an s-lock, locking does not succeed! */
void
rw_lock_x_lock_func(
/*================*/
rw_lock_t* lock, /* in: pointer to rw-lock */
ulint pass, /* in: pass value; != 0, if the lock will
be passed to another thread to unlock */
char* file_name,/* in: file name where lock requested */
ulint line) /* in: line where requested */
{
ulint index; /* index of the reserved wait cell */
ulint state; /* lock state acquired */
ulint i; /* spin round count */
ut_ad(rw_lock_validate(lock));
lock_loop:
/* Acquire the mutex protecting the rw-lock fields */
mutex_enter_fast(&(lock->mutex));
state = rw_lock_x_lock_low(lock, pass, file_name, line);
mutex_exit(&(lock->mutex));
if (state == RW_LOCK_EX) {
return; /* Locking succeeded */
} else if (state == RW_LOCK_NOT_LOCKED) {
/* Spin waiting for the writer field to become free */
i = 0;
while (rw_lock_get_writer(lock) != RW_LOCK_NOT_LOCKED
&& i < SYNC_SPIN_ROUNDS) {
if (srv_spin_wait_delay) {
ut_delay(ut_rnd_interval(0,
srv_spin_wait_delay));
}
i++;
}
if (i == SYNC_SPIN_ROUNDS) {
os_thread_yield();
}
} else if (state == RW_LOCK_WAIT_EX) {
/* Spin waiting for the reader count field to become zero */
i = 0;
while (rw_lock_get_reader_count(lock) != 0
&& i < SYNC_SPIN_ROUNDS) {
if (srv_spin_wait_delay) {
ut_delay(ut_rnd_interval(0,
srv_spin_wait_delay));
}
i++;
}
if (i == SYNC_SPIN_ROUNDS) {
os_thread_yield();
}
} else {
i = 0; /* Eliminate a compiler warning */
ut_error;
}
if (srv_print_latch_waits) {
printf(
"Thread %lu spin wait rw-x-lock at %lx cfile %s cline %lu rnds %lu\n",
os_thread_get_curr_id(), (ulint)lock,
lock->cfile_name, lock->cline, i);
}
rw_x_spin_wait_count++;
/* We try once again to obtain the lock. Acquire the mutex protecting
the rw-lock fields */
mutex_enter(rw_lock_get_mutex(lock));
state = rw_lock_x_lock_low(lock, pass, file_name, line);
if (state == RW_LOCK_EX) {
mutex_exit(rw_lock_get_mutex(lock));
return; /* Locking succeeded */
}
rw_x_system_call_count++;
sync_array_reserve_cell(sync_primary_wait_array,
lock, RW_LOCK_EX,
file_name, line,
&index);
rw_lock_set_waiters(lock, 1);
mutex_exit(rw_lock_get_mutex(lock));
if (srv_print_latch_waits) {
printf(
"Thread %lu OS wait for rw-x-lock at %lx cfile %s cline %lu\n",
os_thread_get_curr_id(), (ulint)lock, lock->cfile_name,
lock->cline);
}
rw_x_system_call_count++;
rw_x_os_wait_count++;
sync_array_wait_event(sync_primary_wait_array, index);
goto lock_loop;
}
/**********************************************************************
Acquires the debug mutex. We cannot use the mutex defined in sync0sync,
because the debug mutex is also acquired in sync0arr while holding the OS
mutex protecting the sync array, and the ordinary mutex_enter might
recursively call routines in sync0arr, leading to a deadlock on the OS
mutex. */
void
rw_lock_debug_mutex_enter(void)
/*==========================*/
{
loop:
if (0 == mutex_enter_nowait(&rw_lock_debug_mutex,
IB__FILE__, __LINE__)) {
return;
}
os_event_reset(rw_lock_debug_event);
rw_lock_debug_waiters = TRUE;
if (0 == mutex_enter_nowait(&rw_lock_debug_mutex,
IB__FILE__, __LINE__)) {
return;
}
os_event_wait(rw_lock_debug_event);
goto loop;
}
/**********************************************************************
Releases the debug mutex. */
void
rw_lock_debug_mutex_exit(void)
/*==========================*/
{
mutex_exit(&rw_lock_debug_mutex);
if (rw_lock_debug_waiters) {
rw_lock_debug_waiters = FALSE;
os_event_set(rw_lock_debug_event);
}
}
/**********************************************************************
Inserts the debug information for an rw-lock. */
void
rw_lock_add_debug_info(
/*===================*/
rw_lock_t* lock, /* in: rw-lock */
ulint pass, /* in: pass value */
ulint lock_type, /* in: lock type */
char* file_name, /* in: file where requested */
ulint line) /* in: line where requested */
{
rw_lock_debug_t* info;
ut_ad(lock);
ut_ad(file_name);
info = rw_lock_debug_create();
rw_lock_debug_mutex_enter();
info->file_name = file_name;
info->line = line;
info->lock_type = lock_type;
info->thread_id = os_thread_get_curr_id();
info->pass = pass;
UT_LIST_ADD_FIRST(list, lock->debug_list, info);
rw_lock_debug_mutex_exit();
if ((pass == 0) && (lock_type != RW_LOCK_WAIT_EX)) {
sync_thread_add_level(lock, lock->level);
}
}
/**********************************************************************
Removes a debug information struct for an rw-lock. */
void
rw_lock_remove_debug_info(
/*======================*/
rw_lock_t* lock, /* in: rw-lock */
ulint pass, /* in: pass value */
ulint lock_type) /* in: lock type */
{
rw_lock_debug_t* info;
ut_ad(lock);
if ((pass == 0) && (lock_type != RW_LOCK_WAIT_EX)) {
sync_thread_reset_level(lock);
}
rw_lock_debug_mutex_enter();
info = UT_LIST_GET_FIRST(lock->debug_list);
while (info != NULL) {
if ((pass == info->pass)
&& ((pass != 0)
|| (info->thread_id == os_thread_get_curr_id()))
&& (info->lock_type == lock_type)) {
/* Found! */
UT_LIST_REMOVE(list, lock->debug_list, info);
rw_lock_debug_mutex_exit();
rw_lock_debug_free(info);
return;
}
info = UT_LIST_GET_NEXT(list, info);
}
ut_error;
}
/**********************************************************************
Sets the rw-lock latching level field. */
void
rw_lock_set_level(
/*==============*/
rw_lock_t* lock, /* in: rw-lock */
ulint level) /* in: level */
{
lock->level = level;
}
/**********************************************************************
Checks if the thread has locked the rw-lock in the specified mode, with
the pass value == 0. */
ibool
rw_lock_own(
/*========*/
/* out: TRUE if locked */
rw_lock_t* lock, /* in: rw-lock */
ulint lock_type) /* in: lock type */
{
rw_lock_debug_t* info;
ut_ad(lock);
ut_ad(rw_lock_validate(lock));
#ifndef UNIV_SYNC_DEBUG
ut_error;
#endif
mutex_enter(&(lock->mutex));
info = UT_LIST_GET_FIRST(lock->debug_list);
while (info != NULL) {
if ((info->thread_id == os_thread_get_curr_id())
&& (info->pass == 0)
&& (info->lock_type == lock_type)) {
mutex_exit(&(lock->mutex));
/* Found! */
return(TRUE);
}
info = UT_LIST_GET_NEXT(list, info);
}
mutex_exit(&(lock->mutex));
return(FALSE);
}
/**********************************************************************
Checks if somebody has locked the rw-lock in the specified mode. */
ibool
rw_lock_is_locked(
/*==============*/
/* out: TRUE if locked */
rw_lock_t* lock, /* in: rw-lock */
ulint lock_type) /* in: lock type: RW_LOCK_SHARED,
RW_LOCK_EX */
{
ibool ret = FALSE;
ut_ad(lock);
ut_ad(rw_lock_validate(lock));
mutex_enter(&(lock->mutex));
if (lock_type == RW_LOCK_SHARED) {
if (lock->reader_count > 0) {
ret = TRUE;
}
} else if (lock_type == RW_LOCK_EX) {
if (lock->writer == RW_LOCK_EX) {
ret = TRUE;
}
} else {
ut_error;
}
mutex_exit(&(lock->mutex));
return(ret);
}
/*******************************************************************
Prints debug info of currently locked rw-locks. */
void
rw_lock_list_print_info(void)
/*=========================*/
{
#ifndef UNIV_SYNC_DEBUG
#else
rw_lock_t* lock;
ulint count = 0;
rw_lock_debug_t* info;
mutex_enter(&rw_lock_list_mutex);
printf("-------------\n");
printf("RW-LATCH INFO\n");
printf("-------------\n");
lock = UT_LIST_GET_FIRST(rw_lock_list);
while (lock != NULL) {
count++;
mutex_enter(&(lock->mutex));
if ((rw_lock_get_writer(lock) != RW_LOCK_NOT_LOCKED)
|| (rw_lock_get_reader_count(lock) != 0)
|| (rw_lock_get_waiters(lock) != 0)) {
printf("RW-LOCK: %lx ", (ulint)lock);
if (rw_lock_get_waiters(lock)) {
printf(" Waiters for the lock exist\n");
} else {
printf("\n");
}
info = UT_LIST_GET_FIRST(lock->debug_list);
while (info != NULL) {
rw_lock_debug_print(info);
info = UT_LIST_GET_NEXT(list, info);
}
}
mutex_exit(&(lock->mutex));
lock = UT_LIST_GET_NEXT(list, lock);
}
printf("Total number of rw-locks %ld\n", count);
mutex_exit(&rw_lock_list_mutex);
#endif
}
/*******************************************************************
Prints debug info of an rw-lock. */
void
rw_lock_print(
/*==========*/
rw_lock_t* lock __attribute__((unused))) /* in: rw-lock */
{
#ifndef UNIV_SYNC_DEBUG
printf(
"Sorry, cannot give rw-lock info in non-debug version!\n");
#else
ulint count = 0;
rw_lock_debug_t* info;
printf("-------------\n");
printf("RW-LATCH INFO\n");
printf("RW-LATCH: %lx ", (ulint)lock);
if ((rw_lock_get_writer(lock) != RW_LOCK_NOT_LOCKED)
|| (rw_lock_get_reader_count(lock) != 0)
|| (rw_lock_get_waiters(lock) != 0)) {
if (rw_lock_get_waiters(lock)) {
printf(" Waiters for the lock exist\n");
} else {
printf("\n");
}
info = UT_LIST_GET_FIRST(lock->debug_list);
while (info != NULL) {
rw_lock_debug_print(info);
info = UT_LIST_GET_NEXT(list, info);
}
}
#endif
}
/*************************************************************************
Prints info of a debug struct. */
void
rw_lock_debug_print(
/*================*/
rw_lock_debug_t* info) /* in: debug struct */
{
ulint rwt;
rwt = info->lock_type;
printf("Locked: thread %ld file %s line %ld ",
info->thread_id, info->file_name, info->line);
if (rwt == RW_LOCK_SHARED) {
printf("S-LOCK");
} else if (rwt == RW_LOCK_EX) {
printf("X-LOCK");
} else if (rwt == RW_LOCK_WAIT_EX) {
printf("WAIT X-LOCK");
} else {
ut_error;
}
if (info->pass != 0) {
printf(" pass value %lu", info->pass);
}
printf("\n");
}
/*******************************************************************
Returns the number of currently locked rw-locks. Works only in the debug
version. */
ulint
rw_lock_n_locked(void)
/*==================*/
{
#ifndef UNIV_SYNC_DEBUG
printf(
"Sorry, cannot give rw-lock info in non-debug version!\n");
ut_error;
return(0);
#else
rw_lock_t* lock;
ulint count = 0;
mutex_enter(&rw_lock_list_mutex);
lock = UT_LIST_GET_FIRST(rw_lock_list);
while (lock != NULL) {
mutex_enter(rw_lock_get_mutex(lock));
if ((rw_lock_get_writer(lock) != RW_LOCK_NOT_LOCKED)
|| (rw_lock_get_reader_count(lock) != 0)) {
count++;
}
mutex_exit(rw_lock_get_mutex(lock));
lock = UT_LIST_GET_NEXT(list, lock);
}
mutex_exit(&rw_lock_list_mutex);
return(count);
#endif
}
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