src/third_party/llvm-project/libcxx/include/__external_threading

#ifndef LIBCPP_EXTERNAL_THREADING_STARBOARD_
#define LIBCPP_EXTERNAL_THREADING_STARBOARD_

#include <__config>
#include <chrono>

#include "starboard/common/recursive_mutex.h"
#include "starboard/condition_variable.h"
#include "starboard/mutex.h"
#include "starboard/once.h"
#include "starboard/thread.h"
#include "starboard/thread_types.h"
#include "starboard/time.h"

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

// Controls the visibility of the declared functions, allowing us to hide them
// from the ABI and prevent redefinitions of the same function.
#define _LIBCPP_THREAD_ABI_VISIBILITY inline _LIBCPP_INLINE_VISIBILITY

#if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(no_thread_safety_analysis)
#define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((no_thread_safety_analysis))
#else
#define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

typedef SbMutex __libcpp_mutex_t;
typedef starboard::RecursiveMutex __libcpp_recursive_mutex_t;
#define _LIBCPP_MUTEX_INITIALIZER SB_MUTEX_INITIALIZER

typedef SbConditionVariable __libcpp_condvar_t;
#define _LIBCPP_CONDVAR_INITIALIZER SB_CONDITION_VARIABLE_INITIALIZER

typedef SbOnceControl __libcpp_exec_once_flag;
#define _LIBCPP_EXEC_ONCE_INITIALIZER SB_ONCE_INITIALIZER

typedef SbThread __libcpp_thread_t;
typedef SbThread __libcpp_thread_id;
typedef SbThreadLocalKey __libcpp_tls_key;
#define _LIBCPP_NULL_THREAD kSbThreadInvalid

// The calling-convention for the thread-local storage destructor. This is
// mostly used on Windows platforms, and documentation can be found at
// https://docs.microsoft.com/en-us/cpp/cpp/stdcall.
#define _LIBCPP_TLS_DESTRUCTOR_CC

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_mutex_lock(__libcpp_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
bool __libcpp_mutex_trylock(__libcpp_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_mutex_unlock(__libcpp_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_mutex_destroy(__libcpp_mutex_t *__m);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_signal(__libcpp_condvar_t* __cv);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_broadcast(__libcpp_condvar_t* __cv);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_condvar_wait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m);

_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
                               timespec *__ts);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_execute_once(__libcpp_exec_once_flag *flag,
                          void (*init_routine)(void));

_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_id_equal(__libcpp_thread_id t1, __libcpp_thread_id t2);

_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_id_less(__libcpp_thread_id t1, __libcpp_thread_id t2);

_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_isnull(const __libcpp_thread_t *__t);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_create(__libcpp_thread_t *__t, void *(*__func)(void *),
                           void *__arg);

_LIBCPP_THREAD_ABI_VISIBILITY
__libcpp_thread_id __libcpp_thread_get_current_id();

_LIBCPP_THREAD_ABI_VISIBILITY
__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t *__t);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_join(__libcpp_thread_t *__t);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_detach(__libcpp_thread_t *__t);

_LIBCPP_THREAD_ABI_VISIBILITY
void __libcpp_thread_yield();

_LIBCPP_THREAD_ABI_VISIBILITY
void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_tls_create(__libcpp_tls_key* __key,
                        void(_LIBCPP_TLS_DESTRUCTOR_CC* __at_exit)(void*));

_LIBCPP_THREAD_ABI_VISIBILITY
void *__libcpp_tls_get(__libcpp_tls_key __key);

_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_tls_set(__libcpp_tls_key __key, void *__p);

#if defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)

// No further initialization required other than simply creating an instance of
// starboard::RecursiveMutex since its constructor initializes it.
int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t* __m) {}

int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t* __m) {
  __m->Acquire();
  return 0;
}

bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t* __m) {
  if (__m->AcquireTry()) {
    return 0;
  }
  return 1;
}

int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t* __m) {
  __m->Release();
  return 0;
}

// Similar situation to the constructor.
int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t* __m) {}

int __libcpp_mutex_lock(__libcpp_mutex_t* __m) { return SbMutexAcquire(__m); }

bool __libcpp_mutex_trylock(__libcpp_mutex_t* __m) {
  return (SbMutexAcquireTry(__m) == kSbMutexAcquired);
}

int __libcpp_mutex_unlock(__libcpp_mutex_t* __m) {
  if (SbMutexRelease(__m)) {
    return 0;
  }
  return 1;
}

int __libcpp_mutex_destroy(__libcpp_mutex_t* __m) {
  if (SbMutexDestroy(__m)) {
    return 0;
  }
  return 1;
}

int __libcpp_condvar_signal(__libcpp_condvar_t* __cv) {
  if (SbConditionVariableSignal(__cv)) {
    return 0;
  }
  return 1;
}

int __libcpp_condvar_broadcast(__libcpp_condvar_t* __cv) {
  if (SbConditionVariableBroadcast(__cv)) {
    return 0;
  }
  return 1;
}

int __libcpp_condvar_wait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m) {
  return SbConditionVariableWait(__cv, __m);
}

int __libcpp_condvar_timedwait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m,
                               timespec* __ts) {
  // Convert the duration provided by __ts to a Starboard time. The conversion
  // is from seconds (10^1) and nanoseconds (10^-9) to microseconds (10^-6).
  const SbTime duration = __ts->tv_sec * 1000000 + __ts->tv_nsec / 1000;
  return SbConditionVariableWaitTimed(__cv, __m, duration);
}

int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv) {
  if (SbConditionVariableDestroy(__cv)) {
    return 0;
  }
  return 1;
}

int __libcpp_execute_once(__libcpp_exec_once_flag* flag,
                          void (*init_routine)(void)) {
  if (SbOnce(flag, init_routine)) {
    return 0;
  }
  return 1;
}

bool __libcpp_thread_id_equal(__libcpp_thread_id t1, __libcpp_thread_id t2) {
  return SbThreadIsEqual(t1, t2);
}

bool __libcpp_thread_id_less(__libcpp_thread_id t1, __libcpp_thread_id t2) {
  return t1 < t2;
}

bool __libcpp_thread_isnull(const __libcpp_thread_t* __t) {
  return !SbThreadIsValid(*__t);
}

int __libcpp_thread_create(__libcpp_thread_t* __t, void* (*__func)(void*),
                           void* __arg) {
  *__t = SbThreadCreate(0, kSbThreadNoPriority, kSbThreadNoAffinity, true, "",
                        __func, __arg);
  if (*__t == kSbThreadInvalid) {
    return 1;
  }
  return 0;
}

__libcpp_thread_id __libcpp_thread_get_current_id() { return SbThreadGetCurrent(); }

__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t* __t) {
  return *__t;
}

int __libcpp_thread_join(__libcpp_thread_t* __t) {
  if (SbThreadJoin(*__t, nullptr)) {
    return 0;
  }
  return 1;
}

int __libcpp_thread_detach(__libcpp_thread_t* __t) {
  SbThreadDetach(*__t);
  return 0;
}

void __libcpp_thread_yield() { SbThreadYield(); }

void __libcpp_thread_sleep_for(const std::chrono::nanoseconds& __ns) {
  // Convert nanoseconds (10^-9) to microseconds (10^-6).
  const SbTime duration = __ns.count() / 1000;
  SbThreadSleep(duration);
}

int __libcpp_tls_create(__libcpp_tls_key* __key, void (*__at_exit)(void*)) {
  const SbThreadLocalKey __k = SbThreadCreateLocalKey(__at_exit);

  if (__k != kSbThreadLocalKeyInvalid) {
    *__key = __k;
    return 0;
  }
  return 1;
}

void* __libcpp_tls_get(__libcpp_tls_key __key) {
  return SbThreadGetLocalValue(__key);
}

int __libcpp_tls_set(__libcpp_tls_key __key, void* __p) {
  if (SbThreadSetLocalValue(__key, __p)) {
    return 0;
  }
  return 1;
}

#endif  // defined(_LIBCPP_HAS_EXTERNAL_THREAD_API)

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // LIBCPP_EXTERNAL_THREADING_STARBOARD_