X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/de6f834747f9af2af9f110ee3ba3bb9f3f0d01f3..43f6b4aae371fca8b5d084e9ceb2484ff867221e:/src/xbt/context_win32.c

diff --git a/src/xbt/context_win32.c b/src/xbt/context_win32.c
new file mode 100644
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+++ b/src/xbt/context_win32.c
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+/********************************************************************************
+ * Copyright (c) 2003, 2004                                                     *
+ * Panagiotis E. Hadjidoukas	(peh@hpclab.ceid.upatras.gr)                    *
+ * HPCLab - University of Patras. All Rights Reserved.                          *
+ * Unix ucontext_t on Windows Operating System, May 2004 (revision 1)           *
+ *                                                                              *
+ * The author disclaims all warranties with regard to this software including   *
+ * all implied warranties of merchantability and fitness for a particular       *
+ * purpose. In no event shall HPCLab be liable for any special, indirect,       *
+ * or consequential damages or any damages whatsoever resulting from            *
+ * loss of use, data or profits, whether in action of contract negligence,      *
+ * or other tortious action, arising out of or in connection with the use       *
+ * or performance of this software.                                             *
+ ********************************************************************************/
+
+/* The original author granted me (Martin Quinson) to redistribute this work 
+   under the LGPL licence, what I here do. */
+
+/*#include "context_win32.h" Not needed since this file is to be included*/
+
+int getcontext(ucontext_t *ucp)
+{
+	int ret;
+
+	/* Retrieve the full machine context */
+	ucp->uc_mcontext.ContextFlags = CONTEXT_FULL;
+	ret = GetThreadContext(GetCurrentThread(), &ucp->uc_mcontext);
+
+	return (ret == 0) ? -1: 0;
+}
+
+int setcontext(const ucontext_t *ucp)
+{
+	int ret;
+	
+	/* Restore the full machine context (already set) */
+	ret = SetThreadContext(GetCurrentThread(), &ucp->uc_mcontext);
+
+	return (ret == 0) ? -1: 0;
+}
+
+int makecontext(ucontext_t *ucp, void (*func)(), int argc, ...)
+{
+	int i;
+    va_list ap;
+	char *sp;
+
+	/* Stack grows down */
+	sp = (char *) (size_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size;	
+
+	/* Reserve stack space for the arguments (maximum possible: argc*(8 bytes per argument)) */
+	sp -= argc*8;
+
+	if ( sp < (char *)ucp->uc_stack.ss_sp) {
+		/* errno = ENOMEM;*/
+		return -1;
+	}
+
+	/* Set the instruction and the stack pointer */
+	ucp->uc_mcontext.Eip = (unsigned long) func;
+	ucp->uc_mcontext.Esp = (unsigned long) sp - 4;
+
+	/* Save/Restore the full machine context */
+	ucp->uc_mcontext.ContextFlags = CONTEXT_FULL;
+
+	/* Copy the arguments */
+	va_start (ap, argc);
+	for (i=0; i<argc; i++) {
+		memcpy(sp, ap, 8);
+		ap +=8;
+		sp += 8;
+	}
+	va_end(ap);
+
+	return 0;
+}
+
+int swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
+{
+	int ret;
+
+	if ((oucp == NULL) || (ucp == NULL)) {
+		/*errno = EINVAL;*/
+		return -1;
+	}
+
+	ret = getcontext(oucp);
+	if (ret == 0) {
+		ret = setcontext(ucp);
+	}
+	return ret;
+}