First Commit

externals/openal-soft/common/threads.cpp

@@ -0,0 +1,197 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 1999-2007 by authors.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include "opthelpers.h"
+#include "threads.h"
+
+#include <system_error>
+
+
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#include <limits>
+
+void althrd_setname(const char *name)
+{
+#if defined(_MSC_VER) && !defined(_M_ARM)
+
+#define MS_VC_EXCEPTION 0x406D1388
+#pragma pack(push,8)
+    struct {
+        DWORD dwType;     // Must be 0x1000.
+        LPCSTR szName;    // Pointer to name (in user addr space).
+        DWORD dwThreadID; // Thread ID (-1=caller thread).
+        DWORD dwFlags;    // Reserved for future use, must be zero.
+    } info;
+#pragma pack(pop)
+    info.dwType = 0x1000;
+    info.szName = name;
+    info.dwThreadID = ~DWORD{0};
+    info.dwFlags = 0;
+
+    __try {
+        RaiseException(MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info);
+    }
+    __except(EXCEPTION_CONTINUE_EXECUTION) {
+    }
+#undef MS_VC_EXCEPTION
+
+#else
+
+    (void)name;
+#endif
+}
+
+namespace al {
+
+semaphore::semaphore(unsigned int initial)
+{
+    if(initial > static_cast<unsigned int>(std::numeric_limits<int>::max()))
+        throw std::system_error(std::make_error_code(std::errc::value_too_large));
+    mSem = CreateSemaphore(nullptr, initial, std::numeric_limits<int>::max(), nullptr);
+    if(mSem == nullptr)
+        throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
+}
+
+semaphore::~semaphore()
+{ CloseHandle(mSem); }
+
+void semaphore::post()
+{
+    if(!ReleaseSemaphore(static_cast<HANDLE>(mSem), 1, nullptr))
+        throw std::system_error(std::make_error_code(std::errc::value_too_large));
+}
+
+void semaphore::wait() noexcept
+{ WaitForSingleObject(static_cast<HANDLE>(mSem), INFINITE); }
+
+bool semaphore::try_wait() noexcept
+{ return WaitForSingleObject(static_cast<HANDLE>(mSem), 0) == WAIT_OBJECT_0; }
+
+} // namespace al
+
+#else
+
+#include <pthread.h>
+#ifdef HAVE_PTHREAD_NP_H
+#include <pthread_np.h>
+#endif
+#include <tuple>
+
+namespace {
+
+using setname_t1 = int(*)(const char*);
+using setname_t2 = int(*)(pthread_t, const char*);
+using setname_t3 = void(*)(pthread_t, const char*);
+using setname_t4 = int(*)(pthread_t, const char*, void*);
+
+void setname_caller(setname_t1 func, const char *name)
+{ func(name); }
+
+void setname_caller(setname_t2 func, const char *name)
+{ func(pthread_self(), name); }
+
+void setname_caller(setname_t3 func, const char *name)
+{ func(pthread_self(), name); }
+
+void setname_caller(setname_t4 func, const char *name)
+{ func(pthread_self(), "%s", static_cast<void*>(const_cast<char*>(name))); }
+
+} // namespace
+
+void althrd_setname(const char *name)
+{
+#if defined(HAVE_PTHREAD_SET_NAME_NP)
+    setname_caller(pthread_set_name_np, name);
+#elif defined(HAVE_PTHREAD_SETNAME_NP)
+    setname_caller(pthread_setname_np, name);
+#endif
+    /* Avoid unused function/parameter warnings. */
+    std::ignore = name;
+    std::ignore = static_cast<void(*)(setname_t1,const char*)>(&setname_caller);
+    std::ignore = static_cast<void(*)(setname_t2,const char*)>(&setname_caller);
+    std::ignore = static_cast<void(*)(setname_t3,const char*)>(&setname_caller);
+    std::ignore = static_cast<void(*)(setname_t4,const char*)>(&setname_caller);
+}
+
+#ifdef __APPLE__
+
+namespace al {
+
+semaphore::semaphore(unsigned int initial)
+{
+    mSem = dispatch_semaphore_create(initial);
+    if(!mSem)
+        throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
+}
+
+semaphore::~semaphore()
+{ dispatch_release(mSem); }
+
+void semaphore::post()
+{ dispatch_semaphore_signal(mSem); }
+
+void semaphore::wait() noexcept
+{ dispatch_semaphore_wait(mSem, DISPATCH_TIME_FOREVER); }
+
+bool semaphore::try_wait() noexcept
+{ return dispatch_semaphore_wait(mSem, DISPATCH_TIME_NOW) == 0; }
+
+} // namespace al
+
+#else /* !__APPLE__ */
+
+#include <cerrno>
+
+namespace al {
+
+semaphore::semaphore(unsigned int initial)
+{
+    if(sem_init(&mSem, 0, initial) != 0)
+        throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
+}
+
+semaphore::~semaphore()
+{ sem_destroy(&mSem); }
+
+void semaphore::post()
+{
+    if(sem_post(&mSem) != 0)
+        throw std::system_error(std::make_error_code(std::errc::value_too_large));
+}
+
+void semaphore::wait() noexcept
+{
+    while(sem_wait(&mSem) == -1 && errno == EINTR) {
+    }
+}
+
+bool semaphore::try_wait() noexcept
+{ return sem_trywait(&mSem) == 0; }
+
+} // namespace al
+
+#endif /* __APPLE__ */
+
+#endif /* _WIN32 */