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erl_lock_check.c
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erl_lock_check.c
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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2005-2012. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights 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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* Needed for VxWorks va_arg */
#include "sys.h"
#ifdef ERTS_ENABLE_LOCK_CHECK
#include "erl_lock_check.h"
#include "erl_term.h"
#include "erl_threads.h"
typedef struct {
char *name;
char *internal_order;
} erts_lc_lock_order_t;
/*
* Global lock order for locks in the emulator.
*
* Locks early (low indexes) in the 'erts_lock_order' array should be
* locked before locks late (high indexes) in the array. Each lock has
* a name which is set on initialization. If multiple locks with the
* same name are used, either an immediate Erlang term (e.g. internal
* pid) or the address of the lock is used for internal lock order.
* The immediate Erlang term used for internal lock order is also set
* on initialization. Locks with small immediate Erlang terms should
* be locked before locks with large immediate Erlang terms, and
* locks with small addresses should be locked before locks with
* large addresses. The immediate terms and adresses (boxed pointers)
* are compared as unsigned integers not as Erlang terms.
*
* Once a spinlock or rw(spin)lock has been locked, the thread is not
* allowed to lock mutexes, rwmutexes or process locks until all
* spinlocks and rwlocks have been unlocked. This restriction is not
* reflected by the lock order below, but the lock checker will still
* check for violations of this restriction.
*/
static erts_lc_lock_order_t erts_lock_order[] = {
/*
* "Lock name" "Internal lock order
* description (NULL
* if only one lock use
* the lock name)"
*/
#ifdef ERTS_SMP
{ "driver_lock", "driver_name" },
{ "port_lock", "port_id" },
#endif
{ "port_data_lock", "address" },
#ifdef ERTS_SMP
{ "bif_timers", NULL },
{ "reg_tab", NULL },
{ "migration_info_update", NULL },
{ "proc_main", "pid" },
#ifdef HIPE
{ "hipe_mfait_lock", NULL },
#endif
{ "nodes_monitors", NULL },
{ "driver_list", NULL },
{ "proc_link", "pid" },
{ "proc_msgq", "pid" },
{ "dist_entry", "address" },
{ "dist_entry_links", "address" },
{ "proc_status", "pid" },
{ "proc_tab", NULL },
{ "ports_snapshot", NULL },
{ "meta_name_tab", "address" },
{ "meta_main_tab_slot", "address" },
{ "db_tab", "address" },
{ "db_tab_fix", "address" },
{ "meta_main_tab_main", NULL },
{ "db_hash_slot", "address" },
{ "node_table", NULL },
{ "dist_table", NULL },
{ "sys_tracers", NULL },
{ "module_tab", NULL },
{ "export_tab", NULL },
{ "fun_tab", NULL },
{ "environ", NULL },
#endif
{ "efile_drv", "address" },
#if defined(ENABLE_CHILD_WAITER_THREAD) || defined(ERTS_SMP)
{ "child_status", NULL },
#endif
#ifdef __WIN32__
{ "sys_driver_data_lock", NULL },
#endif
{ "drv_ev_state_grow", NULL, },
{ "drv_ev_state", "address" },
{ "safe_hash", "address" },
{ "pollset_rm_list", NULL },
{ "removed_fd_pre_alloc_lock", "address" },
{ "state_prealloc", NULL },
{ "schdlr_sspnd", NULL },
{ "run_queue", "address" },
{ "cpu_info", NULL },
{ "pollset", "address" },
#ifdef __WIN32__
{ "pollwaiter", "address" },
{ "break_waiter_lock", NULL },
#endif /* __WIN32__ */
{ "alcu_init_atoms", NULL },
{ "mseg_init_atoms", NULL },
{ "drv_tsd", NULL },
{ "async_enq_mtx", NULL },
#ifdef ERTS_SMP
{ "sys_msg_q", NULL },
{ "atom_tab", NULL },
{ "make_ref", NULL },
{ "misc_op_list_pre_alloc_lock", "address" },
{ "message_pre_alloc_lock", "address" },
{ "ptimer_pre_alloc_lock", "address", },
{ "btm_pre_alloc_lock", NULL, },
{ "dist_entry_out_queue", "address" },
#endif
{ "mtrace_op", NULL },
{ "instr_x", NULL },
{ "instr", NULL },
{ "alcu_allocator", "index" },
{ "sbmbc_alloc", "index" },
{ "mseg", NULL },
#if HALFWORD_HEAP
{ "pmmap", NULL },
#endif
#ifdef ERTS_SMP
{ "port_task_pre_alloc_lock", "address" },
{ "port_taskq_pre_alloc_lock", "address" },
{ "proclist_pre_alloc_lock", "address" },
{ "port_tasks_lock", NULL },
{ "get_free_port", NULL },
{ "port_state", "address" },
{ "xports_list_pre_alloc_lock", "address" },
{ "inet_buffer_stack_lock", NULL },
{ "gc_info", NULL },
{ "io_wake", NULL },
{ "timer_wheel", NULL },
{ "system_block", NULL },
{ "timeofday", NULL },
{ "breakpoints", NULL },
{ "pollsets_lock", NULL },
{ "pix_lock", "address" },
{ "run_queues_lists", NULL },
{ "sched_stat", NULL },
#endif
{ "async_init_mtx", NULL },
#ifdef ERTS_SMP
{ "proc_lck_qs_alloc", NULL },
#endif
#ifdef __WIN32__
#ifdef DEBUG
{ "save_ops_lock", NULL },
#endif
#endif
#ifdef USE_VM_PROBES
{ "efile_drv dtrace mutex", NULL },
#endif
{ "mtrace_buf", NULL },
{ "erts_alloc_hard_debug", NULL }
};
#define ERTS_LOCK_ORDER_SIZE \
(sizeof(erts_lock_order)/sizeof(erts_lc_lock_order_t))
#define LOCK_IS_TYPE_ORDER_VIOLATION(LCK_FLG, LCKD_FLG) \
(((LCKD_FLG) & (ERTS_LC_FLG_LT_SPINLOCK|ERTS_LC_FLG_LT_RWSPINLOCK)) \
&& ((LCK_FLG) \
& ERTS_LC_FLG_LT_ALL \
& ~(ERTS_LC_FLG_LT_SPINLOCK|ERTS_LC_FLG_LT_RWSPINLOCK)))
static __decl_noreturn void __noreturn lc_abort(void);
static char *
lock_type(Uint16 flags)
{
switch (flags & ERTS_LC_FLG_LT_ALL) {
case ERTS_LC_FLG_LT_SPINLOCK: return "[spinlock]";
case ERTS_LC_FLG_LT_RWSPINLOCK: return "[rw(spin)lock]";
case ERTS_LC_FLG_LT_MUTEX: return "[mutex]";
case ERTS_LC_FLG_LT_RWMUTEX: return "[rwmutex]";
case ERTS_LC_FLG_LT_PROCLOCK: return "[proclock]";
default: return "";
}
}
static char *
rw_op_str(Uint16 flags)
{
switch (flags & ERTS_LC_FLG_LO_READ_WRITE) {
case ERTS_LC_FLG_LO_READ_WRITE:
return " (rw)";
case ERTS_LC_FLG_LO_READ:
return " (r)";
case ERTS_LC_FLG_LO_WRITE:
erts_fprintf(stderr, "\nInternal error\n");
lc_abort();
default:
break;
}
return "";
}
typedef struct erts_lc_locked_lock_t_ erts_lc_locked_lock_t;
struct erts_lc_locked_lock_t_ {
erts_lc_locked_lock_t *next;
erts_lc_locked_lock_t *prev;
UWord extra;
Sint16 id;
Uint16 flags;
};
typedef struct {
erts_lc_locked_lock_t *first;
erts_lc_locked_lock_t *last;
} erts_lc_locked_lock_list_t;
typedef struct erts_lc_locked_locks_t_ erts_lc_locked_locks_t;
struct erts_lc_locked_locks_t_ {
char *thread_name;
erts_tid_t tid;
erts_lc_locked_locks_t *next;
erts_lc_locked_locks_t *prev;
erts_lc_locked_lock_list_t locked;
erts_lc_locked_lock_list_t required;
};
typedef union erts_lc_free_block_t_ erts_lc_free_block_t;
union erts_lc_free_block_t_ {
erts_lc_free_block_t *next;
erts_lc_locked_lock_t lock;
};
static ethr_tsd_key locks_key;
static erts_lc_locked_locks_t *erts_locked_locks;
static erts_lc_free_block_t *free_blocks;
#ifdef ERTS_LC_STATIC_ALLOC
#define ERTS_LC_FB_CHUNK_SIZE 10000
#else
#define ERTS_LC_FB_CHUNK_SIZE 10
#endif
static ethr_spinlock_t free_blocks_lock;
static ERTS_INLINE void
lc_lock(void)
{
ethr_spin_lock(&free_blocks_lock);
}
static ERTS_INLINE void
lc_unlock(void)
{
ethr_spin_unlock(&free_blocks_lock);
}
static ERTS_INLINE void lc_free(void *p)
{
erts_lc_free_block_t *fb = (erts_lc_free_block_t *) p;
#ifdef DEBUG
memset((void *) p, 0xdf, sizeof(erts_lc_free_block_t));
#endif
lc_lock();
fb->next = free_blocks;
free_blocks = fb;
lc_unlock();
}
#ifdef ERTS_LC_STATIC_ALLOC
static void *lc_core_alloc(void)
{
lc_unlock();
erts_fprintf(stderr, "Lock checker out of memory!\n");
lc_abort();
}
#else
static void *lc_core_alloc(void)
{
int i;
erts_lc_free_block_t *fbs;
lc_unlock();
fbs = (erts_lc_free_block_t *) malloc(sizeof(erts_lc_free_block_t)
* ERTS_LC_FB_CHUNK_SIZE);
if (!fbs) {
erts_fprintf(stderr, "Lock checker failed to allocate memory!\n");
lc_abort();
}
for (i = 1; i < ERTS_LC_FB_CHUNK_SIZE - 1; i++) {
#ifdef DEBUG
memset((void *) &fbs[i], 0xdf, sizeof(erts_lc_free_block_t));
#endif
fbs[i].next = &fbs[i+1];
}
#ifdef DEBUG
memset((void *) &fbs[ERTS_LC_FB_CHUNK_SIZE-1],
0xdf, sizeof(erts_lc_free_block_t));
#endif
lc_lock();
fbs[ERTS_LC_FB_CHUNK_SIZE-1].next = free_blocks;
free_blocks = &fbs[1];
return (void *) &fbs[0];
}
#endif
static ERTS_INLINE void *lc_alloc(void)
{
void *res;
lc_lock();
if (!free_blocks)
res = lc_core_alloc();
else {
res = (void *) free_blocks;
free_blocks = free_blocks->next;
}
lc_unlock();
return res;
}
static erts_lc_locked_locks_t *
create_locked_locks(char *thread_name)
{
erts_lc_locked_locks_t *l_lcks = malloc(sizeof(erts_lc_locked_locks_t));
if (!l_lcks)
lc_abort();
l_lcks->thread_name = strdup(thread_name ? thread_name : "unknown");
if (!l_lcks->thread_name)
lc_abort();
l_lcks->tid = erts_thr_self();
l_lcks->required.first = NULL;
l_lcks->required.last = NULL;
l_lcks->locked.first = NULL;
l_lcks->locked.last = NULL;
l_lcks->prev = NULL;
lc_lock();
l_lcks->next = erts_locked_locks;
if (erts_locked_locks)
erts_locked_locks->prev = l_lcks;
erts_locked_locks = l_lcks;
lc_unlock();
erts_tsd_set(locks_key, (void *) l_lcks);
return l_lcks;
}
static void
destroy_locked_locks(erts_lc_locked_locks_t *l_lcks)
{
ASSERT(l_lcks->thread_name);
free((void *) l_lcks->thread_name);
ASSERT(l_lcks->required.first == NULL);
ASSERT(l_lcks->required.last == NULL);
ASSERT(l_lcks->locked.first == NULL);
ASSERT(l_lcks->locked.last == NULL);
lc_lock();
if (l_lcks->prev)
l_lcks->prev->next = l_lcks->next;
else {
ASSERT(erts_locked_locks == l_lcks);
erts_locked_locks = l_lcks->next;
}
if (l_lcks->next)
l_lcks->next->prev = l_lcks->prev;
lc_unlock();
free((void *) l_lcks);
}
static ERTS_INLINE erts_lc_locked_locks_t *
get_my_locked_locks(void)
{
return erts_tsd_get(locks_key);
}
static ERTS_INLINE erts_lc_locked_locks_t *
make_my_locked_locks(void)
{
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
if (l_lcks)
return l_lcks;
else
return create_locked_locks(NULL);
}
static ERTS_INLINE erts_lc_locked_lock_t *
new_locked_lock(erts_lc_lock_t *lck, Uint16 op_flags)
{
erts_lc_locked_lock_t *l_lck = (erts_lc_locked_lock_t *) lc_alloc();
l_lck->next = NULL;
l_lck->prev = NULL;
l_lck->id = lck->id;
l_lck->extra = lck->extra;
l_lck->flags = lck->flags | op_flags;
return l_lck;
}
static void
print_lock2(char *prefix, Sint16 id, Wterm extra, Uint16 flags, char *suffix)
{
char *lname = (0 <= id && id < ERTS_LOCK_ORDER_SIZE
? erts_lock_order[id].name
: "unknown");
if (is_not_immed(extra))
erts_fprintf(stderr,
"%s'%s:%p%s'%s%s",
prefix,
lname,
boxed_val(extra),
lock_type(flags),
rw_op_str(flags),
suffix);
else
erts_fprintf(stderr,
"%s'%s:%T%s'%s%s",
prefix,
lname,
extra,
lock_type(flags),
rw_op_str(flags),
suffix);
}
static void
print_lock(char *prefix, erts_lc_lock_t *lck, char *suffix)
{
print_lock2(prefix, lck->id, lck->extra, lck->flags, suffix);
}
static void
print_curr_locks(erts_lc_locked_locks_t *l_lcks)
{
erts_lc_locked_lock_t *l_lck;
if (!l_lcks || !l_lcks->locked.first)
erts_fprintf(stderr,
"Currently no locks are locked by the %s thread.\n",
l_lcks->thread_name);
else {
erts_fprintf(stderr,
"Currently these locks are locked by the %s thread:\n",
l_lcks->thread_name);
for (l_lck = l_lcks->locked.first; l_lck; l_lck = l_lck->next)
print_lock2(" ", l_lck->id, l_lck->extra, l_lck->flags, "\n");
}
}
static void
print_lock_order(void)
{
int i;
erts_fprintf(stderr, "Lock order:\n");
for (i = 1; i < ERTS_LOCK_ORDER_SIZE; i++) {
if (erts_lock_order[i].internal_order)
erts_fprintf(stderr,
" %s:%s\n",
erts_lock_order[i].name,
erts_lock_order[i].internal_order);
else
erts_fprintf(stderr, " %s\n", erts_lock_order[i].name);
}
}
static void
uninitialized_lock(void)
{
erts_fprintf(stderr, "Performing operations on uninitialized lock!\n");
print_curr_locks(get_my_locked_locks());
lc_abort();
}
static void
lock_twice(char *prefix, erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck,
Uint16 op_flags)
{
erts_fprintf(stderr, "%s%s", prefix, rw_op_str(op_flags));
print_lock(" ", lck, " lock which is already locked by thread!\n");
print_curr_locks(l_lcks);
lc_abort();
}
static void
unlock_op_mismatch(erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck,
Uint16 op_flags)
{
erts_fprintf(stderr, "Unlocking%s ", rw_op_str(op_flags));
print_lock("", lck, " lock which mismatch previous lock operation!\n");
print_curr_locks(l_lcks);
lc_abort();
}
static void
unlock_of_not_locked(erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck)
{
print_lock("Unlocking ", lck, " lock which is not locked by thread!\n");
print_curr_locks(l_lcks);
lc_abort();
}
static void
lock_order_violation(erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck)
{
print_lock("Lock order violation occured when locking ", lck, "!\n");
print_curr_locks(l_lcks);
print_lock_order();
lc_abort();
}
static void
type_order_violation(char *op, erts_lc_locked_locks_t *l_lcks,
erts_lc_lock_t *lck)
{
erts_fprintf(stderr, "Lock type order violation occured when ");
print_lock(op, lck, "!\n");
ASSERT(l_lcks);
print_curr_locks(l_lcks);
lc_abort();
}
static void
lock_mismatch(erts_lc_locked_locks_t *l_lcks, int exact,
int failed_have, erts_lc_lock_t *have, int have_len,
int failed_have_not, erts_lc_lock_t *have_not, int have_not_len)
{
int i;
erts_fprintf(stderr, "Lock mismatch found!\n");
if (failed_have >= 0) {
ASSERT(have && have_len > failed_have);
print_lock2("At least the ",
have[failed_have].id, have[failed_have].extra, 0,
" lock is not locked when it should have been\n");
}
else if (failed_have_not >= 0) {
ASSERT(have_not && have_not_len > failed_have_not);
print_lock2("At least the ",
have_not[failed_have_not].id,
have_not[failed_have_not].extra,
0,
" lock is locked when it should not have been\n");
}
if (exact) {
if (!have || have_len <= 0)
erts_fprintf(stderr,
"Thread should not have any locks locked at all\n");
else {
erts_fprintf(stderr,
"Thread should have these and only these locks "
"locked:\n");
for (i = 0; i < have_len; i++)
print_lock2(" ", have[i].id, have[i].extra, 0, "\n");
}
}
else {
if (have && have_len > 0) {
erts_fprintf(stderr,
"Thread should at least have these locks locked:\n");
for (i = 0; i < have_len; i++)
print_lock2(" ", have[i].id, have[i].extra, 0, "\n");
}
if (have_not && have_not_len > 0) {
erts_fprintf(stderr,
"Thread should at least not have these locks "
"locked:\n");
for (i = 0; i < have_not_len; i++)
print_lock2(" ", have_not[i].id, have_not[i].extra, 0, "\n");
}
}
print_curr_locks(l_lcks);
lc_abort();
}
static void
unlock_of_required_lock(erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck)
{
print_lock("Unlocking required ", lck, " lock!\n");
print_curr_locks(l_lcks);
lc_abort();
}
static void
unrequire_of_not_required_lock(erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck)
{
print_lock("Unrequire on ", lck, " lock not required!\n");
print_curr_locks(l_lcks);
lc_abort();
}
static void
require_twice(erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck)
{
print_lock("Require on ", lck, " lock already required!\n");
print_curr_locks(l_lcks);
lc_abort();
}
static void
required_not_locked(erts_lc_locked_locks_t *l_lcks, erts_lc_lock_t *lck)
{
print_lock("Required ", lck, " lock not locked!\n");
print_curr_locks(l_lcks);
lc_abort();
}
static void
thread_exit_handler(void)
{
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
if (l_lcks) {
if (l_lcks->locked.first) {
erts_fprintf(stderr,
"Thread exiting while having locked locks!\n");
print_curr_locks(l_lcks);
lc_abort();
}
destroy_locked_locks(l_lcks);
/* erts_tsd_set(locks_key, NULL); */
}
}
static __decl_noreturn void
lc_abort(void)
{
#ifdef __WIN32__
DebugBreak();
#else
abort();
#endif
}
void
erts_lc_set_thread_name(char *thread_name)
{
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
if (!l_lcks)
(void) create_locked_locks(thread_name);
else {
ASSERT(l_lcks->thread_name);
free((void *) l_lcks->thread_name);
l_lcks->thread_name = strdup(thread_name ? thread_name : "unknown");
if (!l_lcks->thread_name)
lc_abort();
}
}
int
erts_lc_assert_failed(char *file, int line, char *assertion)
{
erts_fprintf(stderr, "%s:%d: Lock check assertion \"%s\" failed!\n",
file, line, assertion);
print_curr_locks(get_my_locked_locks());
lc_abort();
return 0;
}
void erts_lc_fail(char *fmt, ...)
{
va_list args;
erts_fprintf(stderr, "Lock check failed: ");
va_start(args, fmt);
erts_vfprintf(stderr, fmt, args);
va_end(args);
erts_fprintf(stderr, "\n");
print_curr_locks(get_my_locked_locks());
lc_abort();
}
Sint16
erts_lc_get_lock_order_id(char *name)
{
int i;
if (!name || name[0] == '\0')
erts_fprintf(stderr, "Missing lock name\n");
else {
for (i = 0; i < ERTS_LOCK_ORDER_SIZE; i++)
if (strcmp(erts_lock_order[i].name, name) == 0)
return i;
erts_fprintf(stderr,
"Lock name '%s' missing in lock order "
"(update erl_lock_check.c)\n",
name);
}
lc_abort();
return (Sint16) -1;
}
static int
find_lock(erts_lc_locked_lock_t **l_lcks, erts_lc_lock_t *lck)
{
erts_lc_locked_lock_t *l_lck = *l_lcks;
if (l_lck) {
if (l_lck->id == lck->id && l_lck->extra == lck->extra) {
if ((l_lck->flags & lck->flags) == lck->flags)
return 1;
return 0;
}
else if (l_lck->id < lck->id
|| (l_lck->id == lck->id
&& l_lck->extra < lck->extra)) {
for (l_lck = l_lck->next; l_lck; l_lck = l_lck->next) {
if (l_lck->id > lck->id
|| (l_lck->id == lck->id
&& l_lck->extra >= lck->extra)) {
*l_lcks = l_lck;
if (l_lck->id == lck->id
&& l_lck->extra == lck->extra
&& ((l_lck->flags & lck->flags) == lck->flags))
return 1;
return 0;
}
}
}
else {
for (l_lck = l_lck->prev; l_lck; l_lck = l_lck->prev) {
if (l_lck->id < lck->id
|| (l_lck->id == lck->id
&& l_lck->extra <= lck->extra)) {
*l_lcks = l_lck;
if (l_lck->id == lck->id
&& l_lck->extra == lck->extra
&& ((l_lck->flags & lck->flags) == lck->flags))
return 1;
return 0;
}
}
}
}
return 0;
}
static int
find_id(erts_lc_locked_lock_t **l_lcks, Sint16 id)
{
erts_lc_locked_lock_t *l_lck = *l_lcks;
if (l_lck) {
if (l_lck->id == id)
return 1;
else if (l_lck->id < id) {
for (l_lck = l_lck->next; l_lck; l_lck = l_lck->next) {
if (l_lck->id >= id) {
*l_lcks = l_lck;
if (l_lck->id == id)
return 1;
return 0;
}
}
}
else {
for (l_lck = l_lck->prev; l_lck; l_lck = l_lck->prev) {
if (l_lck->id <= id) {
*l_lcks = l_lck;
if (l_lck->id == id)
return 1;
return 0;
}
}
}
}
return 0;
}
void
erts_lc_have_locks(int *resv, erts_lc_lock_t *locks, int len)
{
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
int i;
if (!l_lcks) {
for (i = 0; i < len; i++)
resv[i] = 0;
}
else {
erts_lc_locked_lock_t *l_lck = l_lcks->locked.first;
for (i = 0; i < len; i++)
resv[i] = find_lock(&l_lck, &locks[i]);
}
}
void
erts_lc_have_lock_ids(int *resv, int *ids, int len)
{
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
int i;
if (!l_lcks) {
for (i = 0; i < len; i++)
resv[i] = 0;
}
else {
erts_lc_locked_lock_t *l_lck = l_lcks->locked.first;
for (i = 0; i < len; i++)
resv[i] = find_id(&l_lck, ids[i]);
}
}
void
erts_lc_check(erts_lc_lock_t *have, int have_len,
erts_lc_lock_t *have_not, int have_not_len)
{
int i;
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
erts_lc_locked_lock_t *l_lck;
if (have && have_len > 0) {
if (!l_lcks)
lock_mismatch(NULL, 0,
-1, have, have_len,
-1, have_not, have_not_len);
l_lck = l_lcks->locked.first;
for (i = 0; i < have_len; i++) {
if (!find_lock(&l_lck, &have[i]))
lock_mismatch(l_lcks, 0,
i, have, have_len,
-1, have_not, have_not_len);
}
}
if (have_not && have_not_len > 0 && l_lcks) {
l_lck = l_lcks->locked.first;
for (i = 0; i < have_not_len; i++) {
if (find_lock(&l_lck, &have_not[i]))
lock_mismatch(l_lcks, 0,
-1, have, have_len,
i, have_not, have_not_len);
}
}
}
void
erts_lc_check_exact(erts_lc_lock_t *have, int have_len)
{
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
if (!l_lcks) {
if (have && have_len > 0)
lock_mismatch(NULL, 1,
-1, have, have_len,
-1, NULL, 0);
}
else {
int i;
erts_lc_locked_lock_t *l_lck = l_lcks->locked.first;
for (i = 0; i < have_len; i++) {
if (!find_lock(&l_lck, &have[i]))
lock_mismatch(l_lcks, 1,
i, have, have_len,
-1, NULL, 0);
}
for (i = 0, l_lck = l_lcks->locked.first; l_lck; l_lck = l_lck->next)
i++;
if (i != have_len)
lock_mismatch(l_lcks, 1,
-1, have, have_len,
-1, NULL, 0);
}
}
void
erts_lc_check_no_locked_of_type(Uint16 flags)
{
erts_lc_locked_locks_t *l_lcks = get_my_locked_locks();
if (l_lcks) {
erts_lc_locked_lock_t *l_lck = l_lcks->locked.first;
for (l_lck = l_lcks->locked.first; l_lck; l_lck = l_lck->next) {
if (l_lck->flags & flags) {
erts_fprintf(stderr,
"Locked lock of type %s found which isn't "
"allowed here!\n",
lock_type(l_lck->flags));
print_curr_locks(l_lcks);
lc_abort();
}
}
}
}
int
erts_lc_trylock_force_busy_flg(erts_lc_lock_t *lck, Uint16 op_flags)
{
#ifdef ERTS_LC_DO_NOT_FORCE_BUSY_TRYLOCK_ON_LOCK_ORDER_VIOLATION
return 0;
#else
/*
* Force busy trylock if locking doesn't follow lock order.
* This in order to make sure that caller can handle
* the situation without causing a lock order violation.
*/
erts_lc_locked_locks_t *l_lcks;
if (lck->inited != ERTS_LC_INITITALIZED)
uninitialized_lock();
if (lck->id < 0)
return 0;
l_lcks = get_my_locked_locks();
if (!l_lcks || !l_lcks->locked.first) {
ASSERT(!l_lcks || !l_lcks->locked.last);
return 0;
}
else {
erts_lc_locked_lock_t *tl_lck;
ASSERT(l_lcks->locked.last);
#if 0 /* Ok when trylocking I guess... */
if (LOCK_IS_TYPE_ORDER_VIOLATION(lck->flags, l_lcks->locked.last->flags))
type_order_violation("trylocking ", l_lcks, lck);
#endif
if (l_lcks->locked.last->id < lck->id
|| (l_lcks->locked.last->id == lck->id
&& l_lcks->locked.last->extra < lck->extra))
return 0;
/*
* Lock order violation
*/
/* Check that we are not trying to lock this lock twice */
for (tl_lck = l_lcks->locked.last; tl_lck; tl_lck = tl_lck->prev) {
if (tl_lck->id < lck->id
|| (tl_lck->id == lck->id && tl_lck->extra <= lck->extra)) {
if (tl_lck->id == lck->id && tl_lck->extra == lck->extra)
lock_twice("Trylocking", l_lcks, lck, op_flags);
break;
}
}
#ifndef ERTS_LC_ALLWAYS_FORCE_BUSY_TRYLOCK_ON_LOCK_ORDER_VIOLATION
/* We only force busy if a lock order violation would occur
and when on an even millisecond. */
{
SysTimeval tv;
sys_gettimeofday(&tv);
if ((tv.tv_usec / 1000) & 1)
return 0;
}
#endif
return 1;
}
#endif
}
void erts_lc_trylock_flg(int locked, erts_lc_lock_t *lck, Uint16 op_flags)
{
erts_lc_locked_locks_t *l_lcks;
erts_lc_locked_lock_t *l_lck;
if (lck->inited != ERTS_LC_INITITALIZED)
uninitialized_lock();
if (lck->id < 0)
return;