Fix MacOS and POSIX semaphores related issues

Recently got a MacBook Pro and decided to check how things build on
MacOS. Discovered that POSIX unnamed semaphores weren't implemented, so
I reimplemented them with conditional variable and mutex.

Additionally, fixed scripts and CMake on MacOS

CMakeLists.txt

@@ -22,12 +22,12 @@ else()
 endif()
 
 set(CMAKE_C_FLAGS_ASAN
-    "${CMAKE_C_FLAGS_DEBUG} -fsanitize=address,undefined -fno-omit-frame-pointer" CACHE STRING
+    "${CMAKE_C_FLAGS_DEBUG} -fsanitize=address,undefined -fno-omit-frame-pointer -Wno-deprecated-declarations" CACHE STRING
     "Flags used by the C compiler for Asan build type or configuration." FORCE
 )
 
 set(CMAKE_CXX_FLAGS_ASAN
-    "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=address,undefined -fno-omit-frame-pointer" CACHE STRING
+    "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=address,undefined -fno-omit-frame-pointer -Wno-deprecated-declarations" CACHE STRING
     "Flags used by the C++ compiler for Asan build type or configuration." FORCE
 )
 
@@ -60,6 +60,14 @@ if(ENABLE_LTO)
         message(STATUS "IPO/LTO enabled")
         set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
     endif()
+
+    if (CMAKE_BUILD_TYPE STREQUAL "Debug")
+        message(NOTICE "WARNING: IPO/LTO might cause issues while debugging")
+    endif()
+endif()
+
+if(ENABLE_MT)
+    message(STATUS "Multithreading enabled")
 endif()
 
 # Enable testing
@@ -91,22 +99,22 @@ set(BH_SOURCE
     src/Math/Vec4f.c
     src/Math/Vec4i.c
     src/Queue.c
-    src/Util.c
-    src/String/Int.c
     src/String/Float.c
+    src/String/Int.c
     src/String/Unicode.c
+    src/Util.c
 )
 
 set(BH_HEADER
-    include/BH/Common.h
     include/BH/Algo.h
     include/BH/Args.h
+    include/BH/Common.h
     include/BH/Hashmap.h
     include/BH/IO.h
     include/BH/Math.h
     include/BH/Queue.h
-    include/BH/Util.h
     include/BH/Thread.h
+    include/BH/Util.h
 )
 
 set(BH_SOURCE_DUMMY
@@ -122,12 +130,12 @@ set(BH_SOURCE_POSIX
 )
 
 set(BH_SOURCE_WIN32_MT
+    src/Platform/Spinlock.c
     src/Platform/Win32/Condition.c
     src/Platform/Win32/Mutex.c
     src/Platform/Win32/Semaphore.c
     src/Platform/Win32/Thread.c
     src/Platform/Win32/Tss.c
-    src/Platform/Spinlock.c
 )
 
 set(BH_HEADER_WIN32_MT

cmake/toolchain/i686-w64-mingw32.cmake

@@ -2,6 +2,8 @@
 SET(CMAKE_SYSTEM_NAME      Windows)
 SET(CMAKE_SYSTEM_PROCESSOR i686)
 
+# Check path
+if(EXISTS /usr/bin/i686-w64-mingw32-gcc)
     # which compilers to use for C and C++ and ASM-ATT
     SET(CMAKE_C_COMPILER       /usr/bin/i686-w64-mingw32-gcc)
     SET(CMAKE_CXX_COMPILER     /usr/bin/i686-w64-mingw32-g++)
@@ -9,6 +11,15 @@ SET(CMAKE_ASM-ATT_COMPILER /usr/bin/i686-w64-mingw32-as)
 
     # here is the target environment located
     SET(CMAKE_FIND_ROOT_PATH  /usr/i686-w64-mingw32)
+elseif(EXISTS /usr/local/opt/mingw-w64/toolchain-i686/bin/i686-w64-mingw32-gcc)
+    # which compilers to use for C and C++ and ASM-ATT
+    SET(CMAKE_C_COMPILER       /usr/local/opt/mingw-w64/toolchain-i686/bin/i686-w64-mingw32-gcc)
+    SET(CMAKE_CXX_COMPILER     /usr/local/opt/mingw-w64/toolchain-i686/bin/i686-w64-mingw32-g++)
+    SET(CMAKE_ASM-ATT_COMPILER /usr/local/opt/mingw-w64/toolchain-i686/bin/i686-w64-mingw32-as)
+
+    # here is the target environment located
+    SET(CMAKE_FIND_ROOT_PATH  /usr/local/opt/mingw-w64/toolchain-i686/i686-w64-mingw32)
+endif()
 
 # adjust the default behaviour of the FIND_XXX() commands:
 # search headers and libraries in the target environment, search

cmake/toolchain/x86_64-w64-mingw32.cmake

@@ -2,6 +2,9 @@
 SET(CMAKE_SYSTEM_NAME      Windows)
 SET(CMAKE_SYSTEM_PROCESSOR x86_64)
 
+
+# Check path
+if(EXISTS /usr/bin/x86_64-w64-mingw32-gcc)
     # which compilers to use for C and C++ and ASM-ATT
     SET(CMAKE_C_COMPILER       /usr/bin/x86_64-w64-mingw32-gcc)
     SET(CMAKE_CXX_COMPILER     /usr/bin/x86_64-w64-mingw32-g++)
@@ -9,6 +12,15 @@ SET(CMAKE_ASM-ATT_COMPILER /usr/bin/x86_64-w64-mingw32-as)
 
     # here is the target environment located
     SET(CMAKE_FIND_ROOT_PATH  /usr/x86_64-w64-mingw32)
+elseif(EXISTS /usr/local/opt/mingw-w64/toolchain-x86_64/bin/x86_64-w64-mingw32-gcc)
+    # which compilers to use for C and C++ and ASM-ATT
+    SET(CMAKE_C_COMPILER       /usr/local/opt/mingw-w64/toolchain-x86_64/bin/x86_64-w64-mingw32-gcc)
+    SET(CMAKE_CXX_COMPILER     /usr/local/opt/mingw-w64/toolchain-x86_64/bin/x86_64-w64-mingw32-g++)
+    SET(CMAKE_ASM-ATT_COMPILER /usr/local/opt/mingw-w64/toolchain-x86_64/bin/x86_64-w64-mingw32-as)
+
+    # here is the target environment located
+    SET(CMAKE_FIND_ROOT_PATH  /usr/local/opt/mingw-w64/toolchain-x86_64/x86_64-w64-mingw32)
+endif()
 
 # adjust the default behaviour of the FIND_XXX() commands:
 # search headers and libraries in the target environment, search

src/Platform/Posix/Semaphore.c

@@ -5,6 +5,7 @@
 #include <time.h>
 
 
+#if (_POSIX_SEMAPHORES >= 200112L)
 BH_Semaphore *BH_SemaphoreNew(int value)
 {
     BH_Semaphore *semaphore;
@@ -70,3 +71,125 @@ int BH_SemaphoreWaitFor(BH_Semaphore *semaphore,
         default: return BH_ERROR;
     }
 }
+#else
+BH_Semaphore *BH_SemaphoreNew(int value)
+{
+    BH_Semaphore *semaphore;
+
+    /* Allocate space for mutex and initialize it */
+    semaphore = malloc(sizeof(BH_Semaphore));
+    if (semaphore)
+    {
+        semaphore->count = value;
+        semaphore->waiters = 0;
+
+        if (pthread_mutex_init(&semaphore->mutex, NULL))
+        {
+            free(semaphore);
+            return NULL;
+        }
+
+        if (pthread_cond_init(&semaphore->condition, NULL))
+        {
+            pthread_mutex_destroy(&semaphore->mutex);
+            free(semaphore);
+            return NULL;
+        }
+    }
+
+    return semaphore;
+}
+
+
+void BH_SemaphoreFree(BH_Semaphore *semaphore)
+{
+    /* Destroy condition variable and mutex */
+    pthread_cond_destroy(&semaphore->condition);
+    pthread_mutex_destroy(&semaphore->mutex);
+    free(semaphore);
+}
+
+
+int BH_SemaphorePost(BH_Semaphore *semaphore)
+{
+    /* Increase semaphore value */
+    pthread_mutex_lock(&semaphore->mutex);
+    semaphore->count++;
+    if (semaphore->waiters)
+        pthread_cond_signal(&semaphore->condition);
+    pthread_mutex_unlock(&semaphore->mutex);
+
+    return BH_OK;
+}
+
+
+int BH_SemaphoreWait(BH_Semaphore *semaphore)
+{
+    int result;
+
+    /* Wait until semaphore count is not zero */
+    result = BH_ERROR;
+    pthread_mutex_lock(&semaphore->mutex);
+    semaphore->waiters++;
+    while (!semaphore->count)
+        pthread_cond_wait(&semaphore->condition, &semaphore->mutex);
+    semaphore->waiters--;
+    semaphore->count--;
+    pthread_mutex_unlock(&semaphore->mutex);
+
+    return result;
+}
+
+
+int BH_SemaphoreWaitTry(BH_Semaphore *semaphore)
+{
+    int result;
+
+    result = BH_OK;
+
+    /* Check if semaphore count is not zero and decrement it */
+    pthread_mutex_lock(&semaphore->mutex);
+    if (!semaphore->count)
+        result = BH_ERROR;
+    else
+        semaphore->count--;
+    pthread_mutex_unlock(&semaphore->mutex);
+
+    return result;
+}
+
+
+int BH_SemaphoreWaitFor(BH_Semaphore *semaphore,
+                        uint32_t timeout)
+{
+    int result;
+    struct timespec ts;
+
+    /* Setup timeout */
+    ts.tv_sec = timeout / 1000;
+    ts.tv_nsec = (timeout - ts.tv_sec * 1000) * 1000000;
+    result = BH_OK;
+
+    /* Wait until semaphore count is not zero or timeout */
+    pthread_mutex_lock(&semaphore->mutex);
+    semaphore->waiters++;
+    while (!semaphore->count && result == BH_OK)
+    {
+        switch (pthread_cond_timedwait(&semaphore->condition, &semaphore->mutex, &ts))
+        {
+        case 0: result = BH_OK; break;
+        case ETIMEDOUT: result = BH_TIMEOUT; break;
+        default: result = BH_ERROR; break;
+        }
+    }
+    semaphore->waiters--;
+
+    /* If everything went fine - decrement semaphore counter */
+    if (!result)
+        semaphore->count--;
+
+    pthread_mutex_unlock(&semaphore->mutex);
+
+    return result;
+}
+#endif

src/Platform/Posix/Thread.h

@@ -3,8 +3,8 @@
 
 
 #include <BH/Thread.h>
+#include <unistd.h>
 #include <pthread.h>
-#include <semaphore.h>
 
 
 struct BH_Condition
@@ -19,10 +19,22 @@ struct BH_Mutex
 };
 
 
+#if (_POSIX_SEMAPHORES >= 200112L)
+#include <semaphore.h>
+
 struct BH_Semaphore
 {
     sem_t handle;
 };
+#else
+struct BH_Semaphore
+{
+    int count;
+    int waiters;
+    pthread_mutex_t mutex;
+    pthread_cond_t condition;
+};
+#endif
 
 
 struct BH_Thread

util/style.sh

@@ -12,6 +12,8 @@ if [ ! -f $1 ]; then
     exit 1
 fi
 
+echo "Checking file" $1
+
 
 # Message about trailing space before EOL
 eolerrors=$(grep -n "\s$" "$1" | cut -f1 -d: | while read -r line; do
@@ -22,7 +24,7 @@ done)
 
 
 # Message about non-empty last-line
-linecount=$(($(wc -l "$1" | cut -f1 -d " ") + 1))
+linecount=$(($(wc -l "$1" | xargs | cut -f1 -d " ") + 1))
 lastline=$(tail -n "+$linecount" $1)
 
 llerrors=$(if [ "$lastline" ]; then