1 files changed, 81 insertions, 0 deletions
diff --git a/opentrack-compat/shm.cpp b/opentrack-compat/shm.cpp
new file mode 100644
index 00000000..b18a9933
--- /dev/null
+++ b/opentrack-compat/shm.cpp
@@ -0,0 +1,81 @@
+/* Copyright (c) 2013 Stanisław Halik <sthalik@misaki.pl>
+
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+
+#include <cstring>
+#include "shm.h"
+
+#if defined(_WIN32)
+PortableLockedShm::PortableLockedShm(const char* shmName, const char* mutexName, int mapSize)
+{
+    hMutex = CreateMutexA(NULL, false, mutexName);
+    hMapFile = CreateFileMappingA(
+                 INVALID_HANDLE_VALUE,
+                 NULL,
+                 PAGE_READWRITE,
+                 0,
+                 mapSize,
+                 shmName);
+    mem = MapViewOfFile(hMapFile,
+                        FILE_MAP_WRITE,
+                        0,
+                        0,
+                        mapSize);
+}
+
+PortableLockedShm::~PortableLockedShm()
+{
+    UnmapViewOfFile(mem);
+    CloseHandle(hMapFile);
+    CloseHandle(hMutex);
+}
+
+void PortableLockedShm::lock()
+{
+    (void) WaitForSingleObject(hMutex, INFINITE);
+}
+
+void PortableLockedShm::unlock()
+{
+    (void) ReleaseMutex(hMutex);
+}
+#else
+#pragma GCC diagnostic ignored "-Wunused-result"
+PortableLockedShm::PortableLockedShm(const char *shmName, const char* /*mutexName*/, int mapSize) : size(mapSize)
+{
+    char filename[512] = {0};
+    strcpy(filename, "/");
+    strcat(filename, shmName);
+    fd = shm_open(filename, O_RDWR | O_CREAT, 0600);
+    (void) ftruncate(fd, mapSize);
+    mem = mmap(NULL, mapSize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, (off_t)0);
+}
+
+PortableLockedShm::~PortableLockedShm()
+{
+    (void) munmap(mem, size);
+    (void) close(fd);
+}
+
+void PortableLockedShm::lock()
+{
+    flock(fd, LOCK_EX);
+}
+
+void PortableLockedShm::unlock()
+{
+    flock(fd, LOCK_UN);
+}
+#endif
+
+bool PortableLockedShm::success()
+{
+#ifndef _WIN32
+    return (void*) mem != (void*) -1;
+#else
+    return (void*) mem != NULL;
+#endif
+}