Update contrib/libs/c-ares to 1.34.2

commit_hash:abd65f143c484666e1545e6bbfb9d947df95ecd6

1 files changed, 614 insertions, 0 deletions

diff --git a/contrib/libs/c-ares/src/lib/util/ares_threads.c b/contrib/libs/c-ares/src/lib/util/ares_threads.c
new file mode 100644
index 0000000000..ab0b51afb7
--- /dev/null
+++ b/contrib/libs/c-ares/src/lib/util/ares_threads.c
@@ -0,0 +1,614 @@
+/* MIT License
+ *
+ * Copyright (c) 2023 Brad House
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+#include "ares_private.h"
+
+#ifdef CARES_THREADS
+#  ifdef _WIN32
+
+struct ares_thread_mutex {
+  CRITICAL_SECTION mutex;
+};
+
+ares_thread_mutex_t *ares_thread_mutex_create(void)
+{
+  ares_thread_mutex_t *mut = ares_malloc_zero(sizeof(*mut));
+  if (mut == NULL) {
+    return NULL;
+  }
+
+  InitializeCriticalSection(&mut->mutex);
+  return mut;
+}
+
+void ares_thread_mutex_destroy(ares_thread_mutex_t *mut)
+{
+  if (mut == NULL) {
+    return;
+  }
+  DeleteCriticalSection(&mut->mutex);
+  ares_free(mut);
+}
+
+void ares_thread_mutex_lock(ares_thread_mutex_t *mut)
+{
+  if (mut == NULL) {
+    return;
+  }
+  EnterCriticalSection(&mut->mutex);
+}
+
+void ares_thread_mutex_unlock(ares_thread_mutex_t *mut)
+{
+  if (mut == NULL) {
+    return;
+  }
+  LeaveCriticalSection(&mut->mutex);
+}
+
+struct ares_thread_cond {
+  CONDITION_VARIABLE cond;
+};
+
+ares_thread_cond_t *ares_thread_cond_create(void)
+{
+  ares_thread_cond_t *cond = ares_malloc_zero(sizeof(*cond));
+  if (cond == NULL) {
+    return NULL;
+  }
+  InitializeConditionVariable(&cond->cond);
+  return cond;
+}
+
+void ares_thread_cond_destroy(ares_thread_cond_t *cond)
+{
+  if (cond == NULL) {
+    return;
+  }
+  ares_free(cond);
+}
+
+void ares_thread_cond_signal(ares_thread_cond_t *cond)
+{
+  if (cond == NULL) {
+    return;
+  }
+  WakeConditionVariable(&cond->cond);
+}
+
+void ares_thread_cond_broadcast(ares_thread_cond_t *cond)
+{
+  if (cond == NULL) {
+    return;
+  }
+  WakeAllConditionVariable(&cond->cond);
+}
+
+ares_status_t ares_thread_cond_wait(ares_thread_cond_t  *cond,
+                                    ares_thread_mutex_t *mut)
+{
+  if (cond == NULL || mut == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  SleepConditionVariableCS(&cond->cond, &mut->mutex, INFINITE);
+  return ARES_SUCCESS;
+}
+
+ares_status_t ares_thread_cond_timedwait(ares_thread_cond_t  *cond,
+                                         ares_thread_mutex_t *mut,
+                                         unsigned long        timeout_ms)
+{
+  if (cond == NULL || mut == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  if (!SleepConditionVariableCS(&cond->cond, &mut->mutex, timeout_ms)) {
+    return ARES_ETIMEOUT;
+  }
+
+  return ARES_SUCCESS;
+}
+
+struct ares_thread {
+  HANDLE thread;
+  DWORD  id;
+
+  void *(*func)(void *arg);
+  void *arg;
+  void *rv;
+};
+
+/* Wrap for pthread compatibility */
+static DWORD WINAPI ares_thread_func(LPVOID lpParameter)
+{
+  ares_thread_t *thread = lpParameter;
+
+  thread->rv = thread->func(thread->arg);
+  return 0;
+}
+
+ares_status_t ares_thread_create(ares_thread_t    **thread,
+                                 ares_thread_func_t func, void *arg)
+{
+  ares_thread_t *thr = NULL;
+
+  if (func == NULL || thread == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  thr = ares_malloc_zero(sizeof(*thr));
+  if (thr == NULL) {
+    return ARES_ENOMEM;
+  }
+
+  thr->func   = func;
+  thr->arg    = arg;
+  thr->thread = CreateThread(NULL, 0, ares_thread_func, thr, 0, &thr->id);
+  if (thr->thread == NULL) {
+    ares_free(thr);
+    return ARES_ESERVFAIL;
+  }
+
+  *thread = thr;
+  return ARES_SUCCESS;
+}
+
+ares_status_t ares_thread_join(ares_thread_t *thread, void **rv)
+{
+  ares_status_t status = ARES_SUCCESS;
+
+  if (thread == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  if (WaitForSingleObject(thread->thread, INFINITE) != WAIT_OBJECT_0) {
+    status = ARES_ENOTFOUND;
+  } else {
+    CloseHandle(thread->thread);
+  }
+
+  if (status == ARES_SUCCESS && rv != NULL) {
+    *rv = thread->rv;
+  }
+  ares_free(thread);
+
+  return status;
+}
+
+#  else /* !WIN32 == PTHREAD */
+#    include <pthread.h>
+
+/* for clock_gettime() */
+#    ifdef HAVE_TIME_H
+#      include <time.h>
+#    endif
+
+/* for gettimeofday() */
+#    ifdef HAVE_SYS_TIME_H
+#      include <sys/time.h>
+#    endif
+
+struct ares_thread_mutex {
+  pthread_mutex_t mutex;
+};
+
+ares_thread_mutex_t *ares_thread_mutex_create(void)
+{
+  pthread_mutexattr_t  attr;
+  ares_thread_mutex_t *mut = ares_malloc_zero(sizeof(*mut));
+  if (mut == NULL) {
+    return NULL;
+  }
+
+  if (pthread_mutexattr_init(&attr) != 0) {
+    ares_free(mut); /* LCOV_EXCL_LINE: UntestablePath */
+    return NULL;    /* LCOV_EXCL_LINE: UntestablePath */
+  }
+
+  if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
+    goto fail; /* LCOV_EXCL_LINE: UntestablePath */
+  }
+
+  if (pthread_mutex_init(&mut->mutex, &attr) != 0) {
+    goto fail; /* LCOV_EXCL_LINE: UntestablePath */
+  }
+
+  pthread_mutexattr_destroy(&attr);
+  return mut;
+
+/* LCOV_EXCL_START: UntestablePath */
+fail:
+  pthread_mutexattr_destroy(&attr);
+  ares_free(mut);
+  return NULL;
+  /* LCOV_EXCL_STOP */
+}
+
+void ares_thread_mutex_destroy(ares_thread_mutex_t *mut)
+{
+  if (mut == NULL) {
+    return;
+  }
+  pthread_mutex_destroy(&mut->mutex);
+  ares_free(mut);
+}
+
+void ares_thread_mutex_lock(ares_thread_mutex_t *mut)
+{
+  if (mut == NULL) {
+    return;
+  }
+  pthread_mutex_lock(&mut->mutex);
+}
+
+void ares_thread_mutex_unlock(ares_thread_mutex_t *mut)
+{
+  if (mut == NULL) {
+    return;
+  }
+  pthread_mutex_unlock(&mut->mutex);
+}
+
+struct ares_thread_cond {
+  pthread_cond_t cond;
+};
+
+ares_thread_cond_t *ares_thread_cond_create(void)
+{
+  ares_thread_cond_t *cond = ares_malloc_zero(sizeof(*cond));
+  if (cond == NULL) {
+    return NULL;
+  }
+  pthread_cond_init(&cond->cond, NULL);
+  return cond;
+}
+
+void ares_thread_cond_destroy(ares_thread_cond_t *cond)
+{
+  if (cond == NULL) {
+    return;
+  }
+  pthread_cond_destroy(&cond->cond);
+  ares_free(cond);
+}
+
+void ares_thread_cond_signal(ares_thread_cond_t *cond)
+{
+  if (cond == NULL) {
+    return;
+  }
+  pthread_cond_signal(&cond->cond);
+}
+
+void ares_thread_cond_broadcast(ares_thread_cond_t *cond)
+{
+  if (cond == NULL) {
+    return;
+  }
+  pthread_cond_broadcast(&cond->cond);
+}
+
+ares_status_t ares_thread_cond_wait(ares_thread_cond_t  *cond,
+                                    ares_thread_mutex_t *mut)
+{
+  if (cond == NULL || mut == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  pthread_cond_wait(&cond->cond, &mut->mutex);
+  return ARES_SUCCESS;
+}
+
+static void ares_timespec_timeout(struct timespec *ts, unsigned long add_ms)
+{
+#    if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_REALTIME)
+  clock_gettime(CLOCK_REALTIME, ts);
+#    elif defined(HAVE_GETTIMEOFDAY)
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  ts->tv_sec  = tv.tv_sec;
+  ts->tv_nsec = tv.tv_usec * 1000;
+#    else
+#      error cannot determine current system time
+#    endif
+
+  ts->tv_sec  += (time_t)(add_ms / 1000);
+  ts->tv_nsec += (long)((add_ms % 1000) * 1000000);
+
+  /* Normalize if needed */
+  if (ts->tv_nsec >= 1000000000) {
+    ts->tv_sec  += ts->tv_nsec / 1000000000;
+    ts->tv_nsec %= 1000000000;
+  }
+}
+
+ares_status_t ares_thread_cond_timedwait(ares_thread_cond_t  *cond,
+                                         ares_thread_mutex_t *mut,
+                                         unsigned long        timeout_ms)
+{
+  struct timespec ts;
+
+  if (cond == NULL || mut == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  ares_timespec_timeout(&ts, timeout_ms);
+
+  if (pthread_cond_timedwait(&cond->cond, &mut->mutex, &ts) != 0) {
+    return ARES_ETIMEOUT;
+  }
+
+  return ARES_SUCCESS;
+}
+
+struct ares_thread {
+  pthread_t thread;
+};
+
+ares_status_t ares_thread_create(ares_thread_t    **thread,
+                                 ares_thread_func_t func, void *arg)
+{
+  ares_thread_t *thr = NULL;
+
+  if (func == NULL || thread == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  thr = ares_malloc_zero(sizeof(*thr));
+  if (thr == NULL) {
+    return ARES_ENOMEM; /* LCOV_EXCL_LINE: OutOfMemory */
+  }
+  if (pthread_create(&thr->thread, NULL, func, arg) != 0) {
+    ares_free(thr);        /* LCOV_EXCL_LINE: UntestablePath */
+    return ARES_ESERVFAIL; /* LCOV_EXCL_LINE: UntestablePath */
+  }
+
+  *thread = thr;
+  return ARES_SUCCESS;
+}
+
+ares_status_t ares_thread_join(ares_thread_t *thread, void **rv)
+{
+  void         *ret    = NULL;
+  ares_status_t status = ARES_SUCCESS;
+
+  if (thread == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  if (pthread_join(thread->thread, &ret) != 0) {
+    status = ARES_ENOTFOUND;
+  }
+  ares_free(thread);
+
+  if (status == ARES_SUCCESS && rv != NULL) {
+    *rv = ret;
+  }
+  return status;
+}
+
+#  endif
+
+ares_bool_t ares_threadsafety(void)
+{
+  return ARES_TRUE;
+}
+
+#else /* !CARES_THREADS */
+
+/* NoOp */
+ares_thread_mutex_t *ares_thread_mutex_create(void)
+{
+  return NULL;
+}
+
+void ares_thread_mutex_destroy(ares_thread_mutex_t *mut)
+{
+  (void)mut;
+}
+
+void ares_thread_mutex_lock(ares_thread_mutex_t *mut)
+{
+  (void)mut;
+}
+
+void ares_thread_mutex_unlock(ares_thread_mutex_t *mut)
+{
+  (void)mut;
+}
+
+ares_thread_cond_t *ares_thread_cond_create(void)
+{
+  return NULL;
+}
+
+void ares_thread_cond_destroy(ares_thread_cond_t *cond)
+{
+  (void)cond;
+}
+
+void ares_thread_cond_signal(ares_thread_cond_t *cond)
+{
+  (void)cond;
+}
+
+void ares_thread_cond_broadcast(ares_thread_cond_t *cond)
+{
+  (void)cond;
+}
+
+ares_status_t ares_thread_cond_wait(ares_thread_cond_t  *cond,
+                                    ares_thread_mutex_t *mut)
+{
+  (void)cond;
+  (void)mut;
+  return ARES_ENOTIMP;
+}
+
+ares_status_t ares_thread_cond_timedwait(ares_thread_cond_t  *cond,
+                                         ares_thread_mutex_t *mut,
+                                         unsigned long        timeout_ms)
+{
+  (void)cond;
+  (void)mut;
+  (void)timeout_ms;
+  return ARES_ENOTIMP;
+}
+
+ares_status_t ares_thread_create(ares_thread_t    **thread,
+                                 ares_thread_func_t func, void *arg)
+{
+  (void)thread;
+  (void)func;
+  (void)arg;
+  return ARES_ENOTIMP;
+}
+
+ares_status_t ares_thread_join(ares_thread_t *thread, void **rv)
+{
+  (void)thread;
+  (void)rv;
+  return ARES_ENOTIMP;
+}
+
+ares_bool_t ares_threadsafety(void)
+{
+  return ARES_FALSE;
+}
+#endif
+
+
+ares_status_t ares_channel_threading_init(ares_channel_t *channel)
+{
+  ares_status_t status = ARES_SUCCESS;
+
+  /* Threading is optional! */
+  if (!ares_threadsafety()) {
+    return ARES_SUCCESS;
+  }
+
+  channel->lock = ares_thread_mutex_create();
+  if (channel->lock == NULL) {
+    status = ARES_ENOMEM;
+    goto done;
+  }
+
+  channel->cond_empty = ares_thread_cond_create();
+  if (channel->cond_empty == NULL) {
+    status = ARES_ENOMEM;
+    goto done;
+  }
+
+done:
+  if (status != ARES_SUCCESS) {
+    ares_channel_threading_destroy(channel);
+  }
+  return status;
+}
+
+void ares_channel_threading_destroy(ares_channel_t *channel)
+{
+  ares_thread_mutex_destroy(channel->lock);
+  channel->lock = NULL;
+  ares_thread_cond_destroy(channel->cond_empty);
+  channel->cond_empty = NULL;
+}
+
+void ares_channel_lock(const ares_channel_t *channel)
+{
+  ares_thread_mutex_lock(channel->lock);
+}
+
+void ares_channel_unlock(const ares_channel_t *channel)
+{
+  ares_thread_mutex_unlock(channel->lock);
+}
+
+/* Must not be holding a channel lock already, public function only */
+ares_status_t ares_queue_wait_empty(ares_channel_t *channel, int timeout_ms)
+{
+  ares_status_t  status = ARES_SUCCESS;
+  ares_timeval_t tout;
+
+  if (!ares_threadsafety()) {
+    return ARES_ENOTIMP;
+  }
+
+  if (channel == NULL) {
+    return ARES_EFORMERR;
+  }
+
+  if (timeout_ms >= 0) {
+    ares_tvnow(&tout);
+    tout.sec  += (ares_int64_t)(timeout_ms / 1000);
+    tout.usec += (unsigned int)(timeout_ms % 1000) * 1000;
+  }
+
+  ares_thread_mutex_lock(channel->lock);
+  while (ares_llist_len(channel->all_queries)) {
+    if (timeout_ms < 0) {
+      ares_thread_cond_wait(channel->cond_empty, channel->lock);
+    } else {
+      ares_timeval_t tv_remaining;
+      ares_timeval_t tv_now;
+      unsigned long  tms;
+
+      ares_tvnow(&tv_now);
+      ares_timeval_remaining(&tv_remaining, &tv_now, &tout);
+      tms =
+        (unsigned long)((tv_remaining.sec * 1000) + (tv_remaining.usec / 1000));
+      if (tms == 0) {
+        status = ARES_ETIMEOUT;
+      } else {
+        status =
+          ares_thread_cond_timedwait(channel->cond_empty, channel->lock, tms);
+      }
+
+      /* If there was a timeout, don't loop.  Otherwise, make sure this wasn't
+       * a spurious wakeup by looping and checking the condition. */
+      if (status == ARES_ETIMEOUT) {
+        break;
+      }
+    }
+  }
+  ares_thread_mutex_unlock(channel->lock);
+  return status;
+}
+
+void ares_queue_notify_empty(ares_channel_t *channel)
+{
+  if (channel == NULL) {
+    return;
+  }
+
+  /* We are guaranteed to be holding a channel lock already */
+  if (ares_llist_len(channel->all_queries)) {
+    return;
+  }
+
+  /* Notify all waiters of the conditional */
+  ares_thread_cond_broadcast(channel->cond_empty);
+}