/src/FreeRDP/winpr/libwinpr/thread/thread.c

Source
/**
 * WinPR: Windows Portable Runtime
 * Process Thread Functions
 *
 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2015 Hewlett-Packard Development Company, L.P.
 * Copyright 2021 David Fort <contact@hardening-consulting.com>
 *
 *
 * 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.
 */

#include <winpr/config.h>

#include <winpr/winpr.h>
#include <winpr/assert.h>

#include <winpr/handle.h>

#include <winpr/thread.h>

#if defined(__FreeBSD__)
#include <pthread_np.h>
#elif defined(__linux__)
#include <sys/syscall.h>
#endif

#ifndef MIN
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
#endif

#ifndef MAX
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#endif

/**
 * api-ms-win-core-processthreads-l1-1-1.dll
 *
 * CreateRemoteThread
 * CreateRemoteThreadEx
 * CreateThread
 * DeleteProcThreadAttributeList
 * ExitThread
 * FlushInstructionCache
 * FlushProcessWriteBuffers
 * GetCurrentThread
 * GetCurrentThreadId
 * GetCurrentThreadStackLimits
 * GetExitCodeThread
 * GetPriorityClass
 * GetStartupInfoW
 * GetThreadContext
 * GetThreadId
 * GetThreadIdealProcessorEx
 * GetThreadPriority
 * GetThreadPriorityBoost
 * GetThreadTimes
 * InitializeProcThreadAttributeList
 * OpenThread
 * OpenThreadToken
 * QueryProcessAffinityUpdateMode
 * QueueUserAPC
 * ResumeThread
 * SetPriorityClass
 * SetThreadContext
 * SetThreadPriority
 * SetThreadPriorityBoost
 * SetThreadStackGuarantee
 * SetThreadToken
 * SuspendThread
 * SwitchToThread
 * TerminateThread
 * UpdateProcThreadAttribute
 */

#ifndef _WIN32

#include <winpr/crt.h>
#include <winpr/platform.h>

#include <string.h>
#ifdef WINPR_HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef WINPR_HAVE_SYS_EVENTFD_H
#include <sys/eventfd.h>
#endif

#include <winpr/debug.h>

#include <errno.h>
#include <fcntl.h>

#include <winpr/collections.h>

#include "thread.h"
#include "apc.h"

#include "../handle/handle.h"
#include "../log.h"
#define TAG WINPR_TAG("thread")

static WINPR_THREAD mainThread;

#if defined(WITH_THREAD_LIST)
static wListDictionary* thread_list = NULL;
#endif

static BOOL ThreadCloseHandle(HANDLE handle);
static void cleanup_handle(void* obj);

static BOOL ThreadIsHandled(HANDLE handle)
{
  return WINPR_HANDLE_IS_HANDLED(handle, HANDLE_TYPE_THREAD, FALSE);
}

static int ThreadGetFd(HANDLE handle)
{
  WINPR_THREAD* pThread = (WINPR_THREAD*)handle;

  if (!ThreadIsHandled(handle))
    return -1;

  return pThread->event.fds[0];
}

#define run_mutex_init(fkt, mux, arg) run_mutex_init_(fkt, #fkt, mux, arg)
static BOOL run_mutex_init_(int (*fkt)(pthread_mutex_t*, const pthread_mutexattr_t*),
                            const char* name, pthread_mutex_t* mutex,
                            const pthread_mutexattr_t* mutexattr)
{
  int rc = 0;

  WINPR_ASSERT(fkt);
  WINPR_ASSERT(mutex);

  rc = fkt(mutex, mutexattr);
  if (rc != 0)
  {
    char ebuffer[256] = WINPR_C_ARRAY_INIT;
    WLog_WARN(TAG, "[%s] failed with [%s]", name, winpr_strerror(rc, ebuffer, sizeof(ebuffer)));
  }
  return rc == 0;
}

#define run_mutex_fkt(fkt, mux) run_mutex_fkt_(fkt, #fkt, mux)
static BOOL run_mutex_fkt_(int (*fkt)(pthread_mutex_t* mux), const char* name,
                           pthread_mutex_t* mutex)
{
  int rc = 0;

  WINPR_ASSERT(fkt);
  WINPR_ASSERT(mutex);

  rc = fkt(mutex);
  if (rc != 0)
  {
    char ebuffer[256] = WINPR_C_ARRAY_INIT;
    WLog_WARN(TAG, "[%s] failed with [%s]", name, winpr_strerror(rc, ebuffer, sizeof(ebuffer)));
  }
  return rc == 0;
}

#define run_cond_init(fkt, cond, arg) run_cond_init_(fkt, #fkt, cond, arg)
static BOOL run_cond_init_(int (*fkt)(pthread_cond_t*, const pthread_condattr_t*), const char* name,
                           pthread_cond_t* condition, const pthread_condattr_t* conditionattr)
{
  int rc = 0;

  WINPR_ASSERT(fkt);
  WINPR_ASSERT(condition);

  rc = fkt(condition, conditionattr);
  if (rc != 0)
  {
    char ebuffer[256] = WINPR_C_ARRAY_INIT;
    WLog_WARN(TAG, "[%s] failed with [%s]", name, winpr_strerror(rc, ebuffer, sizeof(ebuffer)));
  }
  return rc == 0;
}

#define run_cond_fkt(fkt, cond) run_cond_fkt_(fkt, #fkt, cond)
static BOOL run_cond_fkt_(int (*fkt)(pthread_cond_t* mux), const char* name,
                          pthread_cond_t* condition)
{
  int rc = 0;

  WINPR_ASSERT(fkt);
  WINPR_ASSERT(condition);

  rc = fkt(condition);
  if (rc != 0)
  {
    char ebuffer[256] = WINPR_C_ARRAY_INIT;
    WLog_WARN(TAG, "[%s] failed with [%s]", name, winpr_strerror(rc, ebuffer, sizeof(ebuffer)));
  }
  return rc == 0;
}

static int pthread_mutex_checked_unlock(pthread_mutex_t* mutex)
{
  WINPR_ASSERT(mutex);
  WINPR_ASSERT(pthread_mutex_trylock(mutex) == EBUSY);
  return pthread_mutex_unlock(mutex);
}

static BOOL mux_condition_bundle_init(mux_condition_bundle* bundle)
{
  WINPR_ASSERT(bundle);

  bundle->val = FALSE;
  if (!run_mutex_init(pthread_mutex_init, &bundle->mux, NULL))
    return FALSE;

  if (!run_cond_init(pthread_cond_init, &bundle->cond, NULL))
    return FALSE;
  return TRUE;
}

static void mux_condition_bundle_uninit(mux_condition_bundle* bundle)
{
  mux_condition_bundle empty = WINPR_C_ARRAY_INIT;

  WINPR_ASSERT(bundle);

  run_cond_fkt(pthread_cond_destroy, &bundle->cond);
  run_mutex_fkt(pthread_mutex_destroy, &bundle->mux);
  *bundle = empty;
}

static BOOL mux_condition_bundle_signal(mux_condition_bundle* bundle)
{
  BOOL rc = TRUE;
  WINPR_ASSERT(bundle);

  if (!run_mutex_fkt(pthread_mutex_lock, &bundle->mux))
    return FALSE;
  bundle->val = TRUE;
  if (!run_cond_fkt(pthread_cond_signal, &bundle->cond))
    rc = FALSE;
  if (!run_mutex_fkt(pthread_mutex_checked_unlock, &bundle->mux))
    rc = FALSE;
  return rc;
}

static BOOL mux_condition_bundle_lock(mux_condition_bundle* bundle)
{
  WINPR_ASSERT(bundle);
  return run_mutex_fkt(pthread_mutex_lock, &bundle->mux);
}

static BOOL mux_condition_bundle_unlock(mux_condition_bundle* bundle)
{
  WINPR_ASSERT(bundle);
  return run_mutex_fkt(pthread_mutex_checked_unlock, &bundle->mux);
}

static BOOL mux_condition_bundle_wait(mux_condition_bundle* bundle, const char* name)
{
  BOOL rc = FALSE;

  WINPR_ASSERT(bundle);
  WINPR_ASSERT(name);
  WINPR_ASSERT(pthread_mutex_trylock(&bundle->mux) == EBUSY);

  while (!bundle->val)
  {
    int r = pthread_cond_wait(&bundle->cond, &bundle->mux);
    if (r != 0)
    {
      char ebuffer[256] = WINPR_C_ARRAY_INIT;
      WLog_ERR(TAG, "failed to wait for %s [%s]", name,
               winpr_strerror(r, ebuffer, sizeof(ebuffer)));
      switch (r)
      {
        case ENOTRECOVERABLE:
        case EPERM:
        case ETIMEDOUT:
        case EINVAL:
          goto fail;

        default:
          break;
      }
    }
  }

  rc = bundle->val;

fail:
  return rc;
}

static BOOL signal_thread_ready(WINPR_THREAD* thread)
{
  WINPR_ASSERT(thread);

  return mux_condition_bundle_signal(&thread->isCreated);
}

static BOOL signal_thread_is_running(WINPR_THREAD* thread)
{
  WINPR_ASSERT(thread);

  return mux_condition_bundle_signal(&thread->isRunning);
}

static DWORD ThreadCleanupHandle(HANDLE handle)
{
  DWORD status = WAIT_FAILED;
  WINPR_THREAD* thread = (WINPR_THREAD*)handle;

  if (!ThreadIsHandled(handle))
    return WAIT_FAILED;

  if (!run_mutex_fkt(pthread_mutex_lock, &thread->mutex))
    return WAIT_FAILED;

  if (!thread->joined)
  {
    int rc = pthread_join(thread->thread, NULL);

    if (rc != 0)
    {
      char ebuffer[256] = WINPR_C_ARRAY_INIT;
      WLog_ERR(TAG, "pthread_join failure: [%d] %s", rc,
               winpr_strerror(rc, ebuffer, sizeof(ebuffer)));
      goto fail;
    }
    else
      thread->joined = TRUE;
  }

  status = WAIT_OBJECT_0;

fail:
  if (!run_mutex_fkt(pthread_mutex_checked_unlock, &thread->mutex))
    return WAIT_FAILED;

  return status;
}

static HANDLE_OPS ops = { ThreadIsHandled,
                        ThreadCloseHandle,
                        ThreadGetFd,
                        ThreadCleanupHandle,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL,
                        NULL };

static void dump_thread(WINPR_THREAD* thread)
{
#if defined(WITH_DEBUG_THREADS)
  void* stack = winpr_backtrace(20);
  char** msg = NULL;
  size_t used = 0;
  WLog_DBG(TAG, "Called from:");
  msg = winpr_backtrace_symbols(stack, &used);

  for (size_t i = 0; i < used; i++)
    WLog_DBG(TAG, "[%" PRIdz "]: %s", i, msg[i]);

  free(msg);
  winpr_backtrace_free(stack);
  WLog_DBG(TAG, "Thread handle created still not closed!");
  msg = winpr_backtrace_symbols(thread->create_stack, &used);

  for (size_t i = 0; i < used; i++)
    WLog_DBG(TAG, "[%" PRIdz "]: %s", i, msg[i]);

  free(msg);

  if (thread->started)
  {
    WLog_DBG(TAG, "Thread still running!");
  }
  else if (!thread->exit_stack)
  {
    WLog_DBG(TAG, "Thread suspended.");
  }
  else
  {
    WLog_DBG(TAG, "Thread exited at:");
    msg = winpr_backtrace_symbols(thread->exit_stack, &used);

    for (size_t i = 0; i < used; i++)
      WLog_DBG(TAG, "[%" PRIdz "]: %s", i, msg[i]);

    free(msg);
  }
#else
  WINPR_UNUSED(thread);
#endif
}

/**
 * TODO: implement thread suspend/resume using pthreads
 * http://stackoverflow.com/questions/3140867/suspend-pthreads-without-using-condition
 */
static BOOL set_event(WINPR_THREAD* thread)
{
  return winpr_event_set(&thread->event);
}

static BOOL reset_event(WINPR_THREAD* thread)
{
  return winpr_event_reset(&thread->event);
}

#if defined(WITH_THREAD_LIST)
static BOOL thread_compare(const void* a, const void* b)
{
  const pthread_t* p1 = a;
  const pthread_t* p2 = b;
  BOOL rc = pthread_equal(*p1, *p2);
  return rc;
}
#endif

static INIT_ONCE threads_InitOnce = INIT_ONCE_STATIC_INIT;
static pthread_t mainThreadId;
static DWORD currentThreadTlsIndex = TLS_OUT_OF_INDEXES;

static BOOL initializeThreads(WINPR_ATTR_UNUSED PINIT_ONCE InitOnce,
                              WINPR_ATTR_UNUSED PVOID Parameter, WINPR_ATTR_UNUSED PVOID* Context)
{
  if (!apc_init(&mainThread.apc))
  {
    WLog_ERR(TAG, "failed to initialize APC");
    goto out;
  }

  mainThread.common.Type = HANDLE_TYPE_THREAD;
  mainThreadId = pthread_self();

  currentThreadTlsIndex = TlsAlloc();
  if (currentThreadTlsIndex == TLS_OUT_OF_INDEXES)
  {
    WLog_ERR(TAG, "Major bug, unable to allocate a TLS value for currentThread");
  }

#if defined(WITH_THREAD_LIST)
  thread_list = ListDictionary_New(TRUE);

  if (!thread_list)
  {
    WLog_ERR(TAG, "Couldn't create global thread list");
    goto error_thread_list;
  }

  thread_list->objectKey.fnObjectEquals = thread_compare;
#endif

out:
  return TRUE;
}

static BOOL signal_and_wait_for_ready(WINPR_THREAD* thread)
{
  BOOL res = FALSE;

  WINPR_ASSERT(thread);

  if (!mux_condition_bundle_lock(&thread->isRunning))
    return FALSE;

  if (!signal_thread_ready(thread))
    goto fail;

  if (!mux_condition_bundle_wait(&thread->isRunning, "threadIsRunning"))
    goto fail;

#if defined(WITH_THREAD_LIST)
  if (!ListDictionary_Contains(thread_list, &thread->thread))
  {
    WLog_ERR(TAG, "Thread not in thread_list, startup failed!");
    goto fail;
  }
#endif

  res = TRUE;

fail:
  if (!mux_condition_bundle_unlock(&thread->isRunning))
    return FALSE;

  return res;
}

/* Thread launcher function responsible for registering
 * cleanup handlers and calling pthread_exit, if not done
 * in thread function. */
static void* thread_launcher(void* arg)
{
  DWORD rc = 0;
  WINPR_THREAD* thread = (WINPR_THREAD*)arg;
  LPTHREAD_START_ROUTINE fkt = NULL;

  if (!thread)
  {
    WLog_ERR(TAG, "Called with invalid argument %p", arg);
    goto exit;
  }

  if (!TlsSetValue(currentThreadTlsIndex, thread))
  {
    WLog_ERR(TAG, "thread %" PRIu64 ", unable to set current thread value",
             WINPR_CXX_COMPAT_CAST(uint64_t, pthread_self()));
    goto exit;
  }

  if (!(fkt = thread->lpStartAddress))
  {
    union
    {
      LPTHREAD_START_ROUTINE fkt;
      void* pv;
    } cnv;
    cnv.fkt = fkt;
    WLog_ERR(TAG, "Thread function argument is %p", cnv.pv);
    goto exit;
  }

  if (!signal_and_wait_for_ready(thread))
    goto exit;

  rc = fkt(thread->lpParameter);
exit:

  if (thread)
  {
    apc_cleanupThread(thread);

    if (!thread->exited)
      thread->dwExitCode = rc;

    set_event(thread);

    (void)signal_thread_ready(thread);

    if (thread->detached || !thread->started)
      cleanup_handle(thread);
  }

  return NULL;
}

static BOOL winpr_StartThread(WINPR_THREAD* thread)
{
  BOOL rc = FALSE;
  BOOL locked = FALSE;
  pthread_attr_t attr = WINPR_C_ARRAY_INIT;

  if (!mux_condition_bundle_lock(&thread->isCreated))
    return FALSE;
  locked = TRUE;

  pthread_attr_init(&attr);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);

  if (thread->dwStackSize > 0)
    pthread_attr_setstacksize(&attr, thread->dwStackSize);

  thread->started = TRUE;
  reset_event(thread);

#if defined(WITH_THREAD_LIST)
  if (!ListDictionary_Add(thread_list, &thread->thread, thread))
  {
    WLog_ERR(TAG, "failed to add the thread to the thread list");
    goto error;
  }
#endif

  if (pthread_create(&thread->thread, &attr, thread_launcher, thread))
    goto error;

  if (!mux_condition_bundle_wait(&thread->isCreated, "threadIsCreated"))
    goto error;

  locked = FALSE;
  if (!mux_condition_bundle_unlock(&thread->isCreated))
    goto error;

  if (!signal_thread_is_running(thread))
  {
    WLog_ERR(TAG, "failed to signal the thread was ready");
    goto error;
  }

  rc = TRUE;
error:
  if (locked)
  {
    if (!mux_condition_bundle_unlock(&thread->isCreated))
      rc = FALSE;
  }

  pthread_attr_destroy(&attr);

  if (rc)
    dump_thread(thread);

  return rc;
}

BOOL SetThreadPriority(HANDLE hThread, int nPriority)
{
  ULONG Type = 0;
  WINPR_HANDLE* Object = NULL;

  if (!winpr_Handle_GetInfo(hThread, &Type, &Object) || Object->Type != HANDLE_TYPE_THREAD)
    return FALSE;

  const int min = 19;
  const int max = 0;
  const int diff = (max - min);
  const int normal = min + diff / 2;
  const int off = MIN(1, diff / 4);
  int sched_priority = -1;

  switch (nPriority & ~(THREAD_MODE_BACKGROUND_BEGIN | THREAD_MODE_BACKGROUND_END))
  {
    case THREAD_PRIORITY_ABOVE_NORMAL:
      sched_priority = MIN(normal + off, max);
      break;
    case THREAD_PRIORITY_BELOW_NORMAL:
      sched_priority = MAX(normal - off, min);
      break;
    case THREAD_PRIORITY_HIGHEST:
      sched_priority = max;
      break;
    case THREAD_PRIORITY_IDLE:
      sched_priority = min;
      break;
    case THREAD_PRIORITY_LOWEST:
      sched_priority = min;
      break;
    case THREAD_PRIORITY_TIME_CRITICAL:
      sched_priority = max;
      break;
    default:
    case THREAD_PRIORITY_NORMAL:
      sched_priority = normal;
      break;
  }
#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L) && defined(PTHREAD_SETSCHEDPRIO)
  WINPR_THREAD* thread = (WINPR_THREAD*)Object;
  const int rc = pthread_setschedprio(thread->thread, sched_priority);
  if (rc != 0)
  {
    char buffer[256] = WINPR_C_ARRAY_INIT;
    WLog_ERR(TAG, "pthread_setschedprio(%d) %s [%d]", sched_priority,
             winpr_strerror(rc, buffer, sizeof(buffer)), rc);
  }
  return rc == 0;
#else
  WLog_WARN(TAG, "pthread_setschedprio(%d) not implemented, requires POSIX 2008 or later",
            sched_priority);
  return TRUE;
#endif
}

HANDLE CreateThread(LPSECURITY_ATTRIBUTES lpThreadAttributes, size_t dwStackSize,
                    LPTHREAD_START_ROUTINE lpStartAddress, LPVOID lpParameter,
                    DWORD dwCreationFlags, WINPR_ATTR_UNUSED LPDWORD lpThreadId)
{
  HANDLE handle = NULL;
  WINPR_THREAD* thread = (WINPR_THREAD*)calloc(1, sizeof(WINPR_THREAD));

  if (!thread)
    return NULL;

  thread->dwStackSize = dwStackSize;
  thread->lpParameter = lpParameter;
  thread->lpStartAddress = lpStartAddress;
  thread->lpThreadAttributes = lpThreadAttributes;
  thread->common.ops = &ops;
#if defined(WITH_DEBUG_THREADS)
  thread->create_stack = winpr_backtrace(20);
  dump_thread(thread);
#endif

  if (!winpr_event_init(&thread->event))
  {
    WLog_ERR(TAG, "failed to create event");
    goto fail;
  }

  if (!run_mutex_init(pthread_mutex_init, &thread->mutex, NULL))
  {
    WLog_ERR(TAG, "failed to initialize thread mutex");
    goto fail;
  }

  if (!apc_init(&thread->apc))
  {
    WLog_ERR(TAG, "failed to initialize APC");
    goto fail;
  }

  if (!mux_condition_bundle_init(&thread->isCreated))
    goto fail;
  if (!mux_condition_bundle_init(&thread->isRunning))
    goto fail;

  WINPR_HANDLE_SET_TYPE_AND_MODE(thread, HANDLE_TYPE_THREAD, WINPR_FD_READ);
  handle = (HANDLE)thread;

  InitOnceExecuteOnce(&threads_InitOnce, initializeThreads, NULL, NULL);

  if (!(dwCreationFlags & CREATE_SUSPENDED))
  {
    if (!winpr_StartThread(thread))
      goto fail;
  }
  else
  {
    if (!set_event(thread))
      goto fail;
  }

  return handle;
fail:
  cleanup_handle(thread);
  return NULL;
}

void cleanup_handle(void* obj)
{
  WINPR_THREAD* thread = (WINPR_THREAD*)obj;
  if (!thread)
    return;

  if (!apc_uninit(&thread->apc))
    WLog_ERR(TAG, "failed to destroy APC");

  mux_condition_bundle_uninit(&thread->isCreated);
  mux_condition_bundle_uninit(&thread->isRunning);
  run_mutex_fkt(pthread_mutex_destroy, &thread->mutex);

  winpr_event_uninit(&thread->event);

#if defined(WITH_THREAD_LIST)
  ListDictionary_Remove(thread_list, &thread->thread);
#endif
#if defined(WITH_DEBUG_THREADS)

  if (thread->create_stack)
    winpr_backtrace_free(thread->create_stack);

  if (thread->exit_stack)
    winpr_backtrace_free(thread->exit_stack);

#endif
  free(thread);
}

BOOL ThreadCloseHandle(HANDLE handle)
{
  WINPR_THREAD* thread = (WINPR_THREAD*)handle;

#if defined(WITH_THREAD_LIST)
  if (!thread_list)
  {
    WLog_ERR(TAG, "Thread list does not exist, check call!");
    dump_thread(thread);
  }
  else if (!ListDictionary_Contains(thread_list, &thread->thread))
  {
    WLog_ERR(TAG, "Thread list does not contain this thread! check call!");
    dump_thread(thread);
  }
  else
  {
    ListDictionary_Lock(thread_list);
#endif
    dump_thread(thread);

    if ((thread->started) && (WaitForSingleObject(thread, 0) != WAIT_OBJECT_0))
    {
      WLog_DBG(TAG, "Thread running, setting to detached state!");
      thread->detached = TRUE;
      pthread_detach(thread->thread);
    }
    else
    {
      cleanup_handle(thread);
    }

#if defined(WITH_THREAD_LIST)
    ListDictionary_Unlock(thread_list);
  }
#endif

  return TRUE;
}

HANDLE CreateRemoteThread(WINPR_ATTR_UNUSED HANDLE hProcess,
                          WINPR_ATTR_UNUSED LPSECURITY_ATTRIBUTES lpThreadAttributes,
                          WINPR_ATTR_UNUSED size_t dwStackSize,
                          WINPR_ATTR_UNUSED LPTHREAD_START_ROUTINE lpStartAddress,
                          WINPR_ATTR_UNUSED LPVOID lpParameter,
                          WINPR_ATTR_UNUSED DWORD dwCreationFlags,
                          WINPR_ATTR_UNUSED LPDWORD lpThreadId)
{
  WLog_ERR(TAG, "not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return NULL;
}

VOID ExitThread(DWORD dwExitCode)
{
#if defined(WITH_THREAD_LIST)
  DWORD rc;
  pthread_t tid = pthread_self();

  if (!thread_list)
  {
    WLog_ERR(TAG, "function called without existing thread list!");
#if defined(WITH_DEBUG_THREADS)
    DumpThreadHandles();
#endif
    pthread_exit(0);
  }
  else if (!ListDictionary_Contains(thread_list, &tid))
  {
    WLog_ERR(TAG, "function called, but no matching entry in thread list!");
#if defined(WITH_DEBUG_THREADS)
    DumpThreadHandles();
#endif
    pthread_exit(0);
  }
  else
  {
    WINPR_THREAD* thread;
    ListDictionary_Lock(thread_list);
    thread = ListDictionary_GetItemValue(thread_list, &tid);
    WINPR_ASSERT(thread);
    thread->exited = TRUE;
    thread->dwExitCode = dwExitCode;
#if defined(WITH_DEBUG_THREADS)
    thread->exit_stack = winpr_backtrace(20);
#endif
    ListDictionary_Unlock(thread_list);
    set_event(thread);
    rc = thread->dwExitCode;

    if (thread->detached || !thread->started)
      cleanup_handle(thread);

    pthread_exit((void*)(size_t)rc);
  }
#else
  WINPR_UNUSED(dwExitCode);
#endif
}

BOOL GetExitCodeThread(HANDLE hThread, LPDWORD lpExitCode)
{
  ULONG Type = 0;
  WINPR_HANDLE* Object = NULL;
  WINPR_THREAD* thread = NULL;

  if (!winpr_Handle_GetInfo(hThread, &Type, &Object) || Object->Type != HANDLE_TYPE_THREAD)
  {
    WLog_ERR(TAG, "hThread is not a thread");
    SetLastError(ERROR_INVALID_PARAMETER);
    return FALSE;
  }

  thread = (WINPR_THREAD*)Object;
  *lpExitCode = thread->dwExitCode;
  return TRUE;
}

WINPR_THREAD* winpr_GetCurrentThread(VOID)
{
  WINPR_THREAD* ret = NULL;

  InitOnceExecuteOnce(&threads_InitOnce, initializeThreads, NULL, NULL);
  if (mainThreadId == pthread_self())
    return (HANDLE)&mainThread;

  ret = TlsGetValue(currentThreadTlsIndex);
  return ret;
}

HANDLE _GetCurrentThread(VOID)
{
  return (HANDLE)winpr_GetCurrentThread();
}

DWORD GetCurrentThreadId(VOID)
{
#if defined(__FreeBSD__)
  return WINPR_CXX_COMPAT_CAST(DWORD, pthread_getthreadid_np());
#elif defined(__linux__)
  return WINPR_CXX_COMPAT_CAST(DWORD, syscall(SYS_gettid));
#else
  pthread_t tid = pthread_self();
  /* Since pthread_t can be 64-bits on some systems, take just the    */
  /* lower 32-bits of it for the thread ID returned by this function. */
  uintptr_t ptid = WINPR_REINTERPRET_CAST(tid, pthread_t, uintptr_t);
  return (ptid & UINT32_MAX) ^ (ptid >> 32);
#endif
}

typedef struct
{
  WINPR_APC_ITEM apc;
  PAPCFUNC completion;
  ULONG_PTR completionArg;
} UserApcItem;

static void userAPC(LPVOID arg)
{
  UserApcItem* userApc = (UserApcItem*)arg;

  userApc->completion(userApc->completionArg);

  userApc->apc.markedForRemove = TRUE;
}

DWORD QueueUserAPC(PAPCFUNC pfnAPC, HANDLE hThread, ULONG_PTR dwData)
{
  ULONG Type = 0;
  WINPR_HANDLE* Object = NULL;
  WINPR_APC_ITEM* apc = NULL;
  UserApcItem* apcItem = NULL;

  if (!pfnAPC)
    return 1;

  if (!winpr_Handle_GetInfo(hThread, &Type, &Object) || Object->Type != HANDLE_TYPE_THREAD)
  {
    WLog_ERR(TAG, "hThread is not a thread");
    SetLastError(ERROR_INVALID_PARAMETER);
    return (DWORD)0;
  }

  apcItem = calloc(1, sizeof(*apcItem));
  if (!apcItem)
  {
    SetLastError(ERROR_INVALID_PARAMETER);
    return (DWORD)0;
  }

  apc = &apcItem->apc;
  apc->type = APC_TYPE_USER;
  apc->markedForFree = TRUE;
  apc->alwaysSignaled = TRUE;
  apc->completion = userAPC;
  apc->completionArgs = apc;
  apcItem->completion = pfnAPC;
  apcItem->completionArg = dwData;
  apc_register(hThread, apc);
  return 1;
}

DWORD ResumeThread(HANDLE hThread)
{
  ULONG Type = 0;
  WINPR_HANDLE* Object = NULL;
  WINPR_THREAD* thread = NULL;

  if (!winpr_Handle_GetInfo(hThread, &Type, &Object) || Object->Type != HANDLE_TYPE_THREAD)
  {
    WLog_ERR(TAG, "hThread is not a thread");
    SetLastError(ERROR_INVALID_PARAMETER);
    return (DWORD)-1;
  }

  thread = (WINPR_THREAD*)Object;

  if (!run_mutex_fkt(pthread_mutex_lock, &thread->mutex))
    return (DWORD)-1;

  if (!thread->started)
  {
    if (!winpr_StartThread(thread))
    {
      run_mutex_fkt(pthread_mutex_checked_unlock, &thread->mutex);
      return (DWORD)-1;
    }
  }
  else
    WLog_WARN(TAG, "Thread already started!");

  if (!run_mutex_fkt(pthread_mutex_checked_unlock, &thread->mutex))
    return (DWORD)-1;

  return 0;
}

DWORD SuspendThread(WINPR_ATTR_UNUSED HANDLE hThread)
{
  WLog_ERR(TAG, "not implemented");
  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
  return (DWORD)-1;
}

BOOL SwitchToThread(VOID)
{
  /**
   * Note: on some operating systems sched_yield is a stub returning -1.
   * usleep should at least trigger a context switch if any thread is waiting.
   */
  if (sched_yield() != 0)
    usleep(1);

  return TRUE;
}

BOOL TerminateThread(HANDLE hThread, DWORD dwExitCode)
{
  ULONG Type = 0;
  WINPR_HANDLE* Object = NULL;
  WINPR_THREAD* thread = NULL;

  if (!winpr_Handle_GetInfo(hThread, &Type, &Object) || Object->Type != HANDLE_TYPE_THREAD)
    return FALSE;

  thread = (WINPR_THREAD*)Object;
  thread->exited = TRUE;
  thread->dwExitCode = dwExitCode;

  if (!run_mutex_fkt(pthread_mutex_lock, &thread->mutex))
    return FALSE;

#ifndef ANDROID
  pthread_cancel(thread->thread);
#else
  WLog_ERR(TAG, "Function not supported on this platform!");
#endif

  if (!run_mutex_fkt(pthread_mutex_checked_unlock, &thread->mutex))
    return FALSE;

  set_event(thread);
  return TRUE;
}

VOID DumpThreadHandles(void)
{
#if defined(WITH_DEBUG_THREADS)
  char** msg = NULL;
  size_t used = 0;
  void* stack = winpr_backtrace(20);
  WLog_DBG(TAG, "---------------- Called from ----------------------------");
  msg = winpr_backtrace_symbols(stack, &used);

  for (size_t i = 0; i < used; i++)
  {
    WLog_DBG(TAG, "[%" PRIdz "]: %s", i, msg[i]);
  }

  free(msg);
  winpr_backtrace_free(stack);
  WLog_DBG(TAG, "---------------- Start Dumping thread handles -----------");

#if defined(WITH_THREAD_LIST)
  if (!thread_list)
  {
    WLog_DBG(TAG, "All threads properly shut down and disposed of.");
  }
  else
  {
    ULONG_PTR* keys = NULL;
    ListDictionary_Lock(thread_list);
    int x, count = ListDictionary_GetKeys(thread_list, &keys);
    WLog_DBG(TAG, "Dumping %d elements", count);

    for (size_t x = 0; x < count; x++)
    {
      WINPR_THREAD* thread = ListDictionary_GetItemValue(thread_list, (void*)keys[x]);
      WLog_DBG(TAG, "Thread [%d] handle created still not closed!", x);
      msg = winpr_backtrace_symbols(thread->create_stack, &used);

      for (size_t i = 0; i < used; i++)
      {
        WLog_DBG(TAG, "[%" PRIdz "]: %s", i, msg[i]);
      }

      free(msg);

      if (thread->started)
      {
        WLog_DBG(TAG, "Thread [%d] still running!", x);
      }
      else
      {
        WLog_DBG(TAG, "Thread [%d] exited at:", x);
        msg = winpr_backtrace_symbols(thread->exit_stack, &used);

        for (size_t i = 0; i < used; i++)
          WLog_DBG(TAG, "[%" PRIdz "]: %s", i, msg[i]);

        free(msg);
      }
    }

    free(keys);
    ListDictionary_Unlock(thread_list);
  }
#endif

  WLog_DBG(TAG, "---------------- End Dumping thread handles -------------");
#endif
}
#endif

Coverage Report

Created: 2026-02-26 06:50