1 files changed, 122 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/common/library/globals.c b/bundles/org.eclipse.swt/Eclipse SWT/common/library/globals.c
new file mode 100755
index 0000000000..066c1d7052
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT/common/library/globals.c
@@ -0,0 +1,122 @@
+/**
+ * globals.c
+ *
+ * This file contains the global struct allocation routines for the
+ * SWT library.
+ *
+ */
+
+#include <malloc.h>
+#include <assert.h>
+#include <memory.h>
+#include <jni.h>
+#include "globals.h"
+#include "library.h"
+
+static void CreateLibGlobals(JNIEnv * env);
+static void DestroyLibGlobals(JNIEnv * env);
+static GLOBAL_TABLE * JNICALL GetGlobals(void);
+
+/* Place holder for all globals */
+GLOBALS globals = {0};
+GLOBAL_TABLE globals_table = {{
+	0, 0, 0, 0, 0, 0, 0, 0, /* 8 */
+	0, 0, 0, 0, 0, 0, 0, 0, /* 16 */
+	0, 0, 0, 0, 0, 0, 0, 0, /* 24 */
+	0, 0, 0, 0, 0, 0, 0, 0, /* 32 */
+	0, 0, 0, 0, 0, 0, 0, 0, /* 40 */
+	0, 0, 0, 0, 0, 0, 0, 0, /* 48 */
+	0, 0, 0, 0, 0, 0, 0, 0, /* 56 */
+	0, 0, 0, 0, 0, 0, 0, &globals, /* 64 */
+}};
+GetGlobalsFunc getGlobals = &GetGlobals;
+unsigned int vm_library = 0;
+
+/*
+ * Hook the library load.
+ */
+JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
+{
+	JNIEnv * env;
+
+	(*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_2);
+	vm_library = OpenLibrary("jvm");
+	DEBUG_PRINTF(("VM Shared library -> %d\n", vm_library));
+
+	if (vm_library != 0) {
+		unsigned int func = LibraryLookupName(vm_library, "MdCurrentJNIGlobals");
+		if (func == 0) func = LibraryLookupName(vm_library, "_MdCurrentJNIGlobals@0");
+
+		DEBUG_PRINTF(("Function address -> %x\n", func));
+		if (func != 0) getGlobals = (GetGlobalsFunc)func;
+	}
+	CreateLibGlobals(env);
+	return JNI_VERSION_1_2;
+}
+
+/*
+ * Hook the library unload.
+ */
+JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *vm, void *reserved)
+{
+	JNIEnv * env;
+
+	(*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_2);
+	DestroyLibGlobals(env);
+	CloseLibrary(vm_library);
+}
+
+/*
+ * Allocate and initialize a SWT GLOBALS struct.
+ */
+static void CreateLibGlobals(JNIEnv * env)
+{
+	GLOBALS * globs = GET_GLOBALS();
+	if (globs != NULL && globs == &globals) return;
+	
+	globs = (GLOBALS *)malloc(sizeof(GLOBALS));
+	if (!globs)
+	{
+		jclass hExcClass = (*env)->FindClass(env, "java/lang/OutOfMemoryError");
+		assert(hExcClass);
+		(*env)->ThrowNew(env, hExcClass, "Unable to allocate globals in onLoad");
+		return;
+	}
+	memset(globs, 0, sizeof(GLOBALS));
+
+	/* Start of initialization code. */
+	globs->multidata = 1;
+	globs->vajava = vm_library != 0 && 
+		(LibraryLookupName(vm_library, "_MdCurrentJavaVM@0") != 0 ||
+		LibraryLookupName(vm_library, "MdCurrentJavaVM") != 0);
+	/* End of initialization code. */
+
+	SET_GLOBALS(globs);
+}
+
+/* 
+ * Free a SWT GLOBALS struct.
+ */
+static void DestroyLibGlobals(JNIEnv * env)
+{
+	GLOBALS * globs = GET_GLOBALS();
+	if (globs && (globs != &globals)) 
+	{
+		/* Start of cleanup code. */
+		/* End of cleanup code. */
+
+		free(globs);
+
+		SET_GLOBALS(NULL);
+	}
+}
+
+/* Note that the function below do not make
+ * the vm reentrant but allow the multidata code
+ * to work in non reentrant VMs.
+ */
+/* Answer the table of globals associated with the current. */
+static GLOBAL_TABLE * JNICALL GetGlobals(void)
+{
+	return &globals_table;
+}