Shared memory segment manager in userland

3 files changed, 32 insertions, 1 deletions

diff --git a/src/include/gc/shm.h b/src/include/gc/shm.h
new file mode 100644
index 0000000..1a3f0a1
--- /dev/null
+++ b/src/include/gc/shm.h
@@ -0,0 +1,16 @@
+#ifndef DEF_SHM_H
+#define DEF_SHM_H
+
+#include <gc/syscall.h>
+
+/*
+ * This file contains headers for the shared segment mapping manager.
+ */
+
+void* shm_alloc(size_t size);	//allocates a spot in shared memory space
+void shm_free(void* p);			//frees a spot
+
+void* shm_allocNew(size_t size);	//calls shm_alloc, and maps a new segment there
+void shm_freeDel(void* p);			//unmaps segment and calls shm_free
+
+#endif
diff --git a/src/include/gc/syscall.h b/src/include/gc/syscall.h
index f731e10..c93a523 100644
--- a/src/include/gc/syscall.h
+++ b/src/include/gc/syscall.h
@@ -13,7 +13,7 @@ typedef char		int8_t;
 typedef unsigned size_t;
 
 struct user_request {
-	uint32_t func, params[3];
+	uint32_t func, params[3], shmsize[3];
 	int isBlocking;		// 1 : blocking request, 0 : nonblocking request (message)
 };
 
diff --git a/src/include/mutex.h b/src/include/mutex.h
new file mode 100644
index 0000000..50b5606
--- /dev/null
+++ b/src/include/mutex.h
@@ -0,0 +1,15 @@
+#ifndef DEF_MUTEX_H
+#define DEF_MUTEX_H
+
+#include <gc/syscall.h>
+
+#define MUTEX_LOCKED 1
+#define MUTEX_UNLOCKED 0
+
+//A mutex is just an uint32_t
+
+void mutex_lock(uint32_t* mutex);	//wait for mutex to be free
+int mutex_lockE(uint32_t* mutex);	//lock mutex only if free, returns !0 if locked, 0 if was busy
+void mutex_unlock(uint32_t* mutex);
+
+#endif