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This commit is contained in:
Evan Hunt
2020-02-13 14:44:37 -08:00
parent 0255a97473
commit e851ed0bb5
669 changed files with 35995 additions and 42219 deletions
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95
lib/isc/rwlock.c
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@@ -33,8 +33,7 @@
isc_result_t
isc_rwlock_init(isc_rwlock_t *rwl, unsigned int read_quota,
unsigned int write_quota)
{
unsigned int write_quota) {
UNUSED(read_quota);
UNUSED(write_quota);
REQUIRE(pthread_rwlock_init(&rwl->rwlock, NULL) == 0);
@@ -43,8 +42,7 @@ isc_rwlock_init(isc_rwlock_t *rwl, unsigned int read_quota,
}
isc_result_t
isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
switch (type) {
case isc_rwlocktype_read:
REQUIRE(pthread_rwlock_rdlock(&rwl->rwlock) == 0);
@@ -71,8 +69,7 @@ isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
}
isc_result_t
isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
int ret = 0;
switch (type) {
case isc_rwlocktype_read:
@@ -103,23 +100,20 @@ isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
}
isc_result_t
isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
UNUSED(type);
REQUIRE(pthread_rwlock_unlock(&rwl->rwlock) == 0);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_rwlock_tryupgrade(isc_rwlock_t *rwl)
{
isc_rwlock_tryupgrade(isc_rwlock_t *rwl) {
UNUSED(rwl);
return (ISC_R_LOCKBUSY);
}
void
isc_rwlock_downgrade(isc_rwlock_t *rwl)
{
isc_rwlock_downgrade(isc_rwlock_t *rwl) {
atomic_store_release(&rwl->downgrade, true);
isc_rwlock_unlock(rwl, isc_rwlocktype_write);
isc_rwlock_lock(rwl, isc_rwlocktype_read);
@@ -127,14 +121,13 @@ isc_rwlock_downgrade(isc_rwlock_t *rwl)
}
void
isc_rwlock_destroy(isc_rwlock_t *rwl)
{
isc_rwlock_destroy(isc_rwlock_t *rwl) {
pthread_rwlock_destroy(&rwl->rwlock);
}
#else /* if USE_PTHREAD_RWLOCK */
#define RWLOCK_MAGIC ISC_MAGIC('R', 'W', 'L', 'k')
#define RWLOCK_MAGIC ISC_MAGIC('R', 'W', 'L', 'k')
#define VALID_RWLOCK(rwl) ISC_MAGIC_VALID(rwl, RWLOCK_MAGIC)
#ifndef RWLOCK_DEFAULT_READ_QUOTA
@@ -172,8 +165,7 @@ isc_rwlock_destroy(isc_rwlock_t *rwl)
#define isc_rwlock_pause()
#endif /* if defined(_MSC_VER) */
static isc_result_t
isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type);
static isc_result_t isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type);
#ifdef ISC_RWLOCK_TRACE
#include <stdio.h> /* Required for fprintf/stderr. */
@@ -181,8 +173,7 @@ isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type);
#include <isc/thread.h> /* Required for isc_thread_self(). */
static void
print_lock(const char *operation, isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
print_lock(const char *operation, isc_rwlock_t *rwl, isc_rwlocktype_t type) {
fprintf(stderr,
"rwlock %p thread %lu %s(%s): "
"write_requests=%u, write_completions=%u, "
@@ -199,8 +190,7 @@ print_lock(const char *operation, isc_rwlock_t *rwl, isc_rwlocktype_t type)
isc_result_t
isc_rwlock_init(isc_rwlock_t *rwl, unsigned int read_quota,
unsigned int write_quota)
{
unsigned int write_quota) {
REQUIRE(rwl != NULL);
/*
@@ -235,8 +225,7 @@ isc_rwlock_init(isc_rwlock_t *rwl, unsigned int read_quota,
}
void
isc_rwlock_destroy(isc_rwlock_t *rwl)
{
isc_rwlock_destroy(isc_rwlock_t *rwl) {
REQUIRE(VALID_RWLOCK(rwl));
REQUIRE(atomic_load_acquire(&rwl->write_requests) ==
@@ -313,11 +302,10 @@ isc_rwlock_destroy(isc_rwlock_t *rwl)
*/
#define WRITER_ACTIVE 0x1
#define READER_INCR 0x2
#define READER_INCR 0x2
static isc_result_t
isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
int32_t cntflag;
REQUIRE(VALID_RWLOCK(rwl));
@@ -328,11 +316,13 @@ isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
if (type == isc_rwlocktype_read) {
if (atomic_load_acquire(&rwl->write_requests) !=
atomic_load_acquire(&rwl->write_completions)) {
atomic_load_acquire(&rwl->write_completions))
{
/* there is a waiting or active writer */
LOCK(&rwl->lock);
if (atomic_load_acquire(&rwl->write_requests) !=
atomic_load_acquire(&rwl->write_completions)) {
atomic_load_acquire(&rwl->write_completions))
{
rwl->readers_waiting++;
WAIT(&rwl->readable, &rwl->lock);
rwl->readers_waiting--;
@@ -412,7 +402,8 @@ isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
while (1) {
int_fast32_t zero = 0;
if (atomic_compare_exchange_weak_acq_rel(
&rwl->cnt_and_flag, &zero, WRITER_ACTIVE)) {
&rwl->cnt_and_flag, &zero, WRITER_ACTIVE))
{
break;
}
@@ -437,11 +428,10 @@ isc__rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
}
isc_result_t
isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
int32_t cnt = 0;
int32_t spins = atomic_load_acquire(&rwl->spins) * 2 + 10;
int32_t max_cnt = ISC_MAX(spins, RWLOCK_MAX_ADAPTIVE_COUNT);
isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
int32_t cnt = 0;
int32_t spins = atomic_load_acquire(&rwl->spins) * 2 + 10;
int32_t max_cnt = ISC_MAX(spins, RWLOCK_MAX_ADAPTIVE_COUNT);
isc_result_t result = ISC_R_SUCCESS;
do {
@@ -458,8 +448,7 @@ isc_rwlock_lock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
}
isc_result_t
isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
int32_t cntflag;
REQUIRE(VALID_RWLOCK(rwl));
@@ -471,7 +460,8 @@ isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
if (type == isc_rwlocktype_read) {
/* If a writer is waiting or working, we fail. */
if (atomic_load_acquire(&rwl->write_requests) !=
atomic_load_acquire(&rwl->write_completions)) {
atomic_load_acquire(&rwl->write_completions))
{
return (ISC_R_LOCKBUSY);
}
@@ -491,7 +481,8 @@ isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
*/
if (cntflag == READER_INCR &&
atomic_load_acquire(&rwl->write_completions) !=
atomic_load_acquire(&rwl->write_requests)) {
atomic_load_acquire(&rwl->write_requests))
{
LOCK(&rwl->lock);
BROADCAST(&rwl->writeable);
UNLOCK(&rwl->lock);
@@ -502,8 +493,9 @@ isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
} else {
/* Try locking without entering the waiting queue. */
int_fast32_t zero = 0;
if (!atomic_compare_exchange_weak_acq_rel(
&rwl->cnt_and_flag, &zero, WRITER_ACTIVE)) {
if (!atomic_compare_exchange_weak_acq_rel(&rwl->cnt_and_flag,
&zero, WRITER_ACTIVE))
{
return (ISC_R_LOCKBUSY);
}
@@ -523,8 +515,7 @@ isc_rwlock_trylock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
}
isc_result_t
isc_rwlock_tryupgrade(isc_rwlock_t *rwl)
{
isc_rwlock_tryupgrade(isc_rwlock_t *rwl) {
REQUIRE(VALID_RWLOCK(rwl));
{
@@ -555,15 +546,14 @@ isc_rwlock_tryupgrade(isc_rwlock_t *rwl)
}
void
isc_rwlock_downgrade(isc_rwlock_t *rwl)
{
isc_rwlock_downgrade(isc_rwlock_t *rwl) {
int32_t prev_readers;
REQUIRE(VALID_RWLOCK(rwl));
/* Become an active reader. */
prev_readers =
atomic_fetch_add_release(&rwl->cnt_and_flag, READER_INCR);
prev_readers = atomic_fetch_add_release(&rwl->cnt_and_flag,
READER_INCR);
/* We must have been a writer. */
INSIST((prev_readers & WRITER_ACTIVE) != 0);
@@ -580,8 +570,7 @@ isc_rwlock_downgrade(isc_rwlock_t *rwl)
}
isc_result_t
isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
{
isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
int32_t prev_cnt;
REQUIRE(VALID_RWLOCK(rwl));
@@ -600,7 +589,8 @@ isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
*/
if (prev_cnt == READER_INCR &&
atomic_load_acquire(&rwl->write_completions) !=
atomic_load_acquire(&rwl->write_requests)) {
atomic_load_acquire(&rwl->write_requests))
{
LOCK(&rwl->lock);
BROADCAST(&rwl->writeable);
UNLOCK(&rwl->lock);
@@ -619,8 +609,8 @@ isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
rwl->write_quota) ||
(atomic_load_acquire(&rwl->write_requests) ==
atomic_load_acquire(&rwl->write_completions)) ||
(atomic_load_acquire(&rwl->cnt_and_flag) &
~WRITER_ACTIVE)) {
(atomic_load_acquire(&rwl->cnt_and_flag) & ~WRITER_ACTIVE))
{
/*
* We have passed the write quota, no writer is
* waiting, or some readers are almost ready, pending
@@ -639,7 +629,8 @@ isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type)
if ((atomic_load_acquire(&rwl->write_requests) !=
atomic_load_acquire(&rwl->write_completions)) &&
wakeup_writers) {
wakeup_writers)
{
LOCK(&rwl->lock);
BROADCAST(&rwl->writeable);
UNLOCK(&rwl->lock);