added preliminary shared memory physics client/server

fix a bug in CommonMultiBodyBase: don't use data if it hasn't been allocated
2015-05-28 16:05:24 -07:00
parent 8005b7167e
commit 82576d0bee
13 changed files with 489 additions and 1 deletions
--- a/examples/SharedMemory/PosixSharedMemory.cpp
+++ b/examples/SharedMemory/PosixSharedMemory.cpp
@@ -0,0 +1,84 @@
+#include "PosixSharedMemory.h"
+#include "Bullet3Common/b3Logging.h"
+#include "LinearMath/btScalar.h" //for btAssert
+#ifdef __APPLE__
+//#define TEST_SHARED_MEMORY
+#endif
+
+#include <stddef.h>
+
+#ifdef TEST_SHARED_MEMORY
+
+#include <sys/shm.h>
+#include <sys/ipc.h>
+
+#endif
+
+struct PosixSharedMemoryInteralData
+{
+
+};
+PosixSharedMemory::PosixSharedMemory()
+{
+    
+    m_internalData = new PosixSharedMemoryInteralData;
+}
+
+PosixSharedMemory::~PosixSharedMemory()
+{
+    delete m_internalData;
+}
+
+struct btPointerCaster
+{
+    union
+    {
+        void* ptr;
+        ptrdiff_t integer;
+    };
+};
+
+void*   PosixSharedMemory::allocateSharedMemory(int key, int size)
+{
+#ifdef TEST_SHARED_MEMORY
+    int flags = IPC_CREAT | 0666;
+    int id = shmget((key_t) key, (size_t) size,flags);
+    if (id < 0)
+    {
+        b3Error("shmget error");
+    } else
+    {
+        btPointerCaster result;
+        result.ptr = shmat(id,0,0);
+        if (result.integer == -1)
+        {
+            b3Error("shmat returned -1");
+        } else
+        {
+            return result.ptr;
+        }
+    }
+#else
+    //not implemented yet
+    btAssert(0);
+#endif
+    return 0;
+}
+void PosixSharedMemory::releaseSharedMemory(int key, int size)
+{
+#ifdef TEST_SHARED_MEMORY
+    int flags = 0666;
+    int id = shmget((key_t) key, (size_t) size,flags);
+    if (id < 0)
+    {
+        b3Error("shmget error");
+    } else
+    {
+        int result = shmctl(id,IPC_RMID,0);
+        if (result == -1)
+        {
+            b3Error("shmat returned -1");
+        }
+    }
+#endif
+}