implement mlock(), munlock()

Change-Id: I2f04b8986d2ed32bb4d30d238d668e21a1505778
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1991
Reviewed-by: Adrien Destugues <[email protected]>

headers/posix/sys/mman.h

@@ -61,6 +61,9 @@ int		msync(void* address, size_t length, int flags);
 int		madvise(void* address, size_t length, int advice);
 int		posix_madvise(void* address, size_t length, int advice);
 
+int		mlock(const void* address, size_t length);
+int		munlock(const void* address, size_t length);
+
 int		shm_open(const char* name, int openMode, mode_t permissions);
 int		shm_unlink(const char* name);
 

headers/private/kernel/thread_types.h

@@ -26,6 +26,8 @@
 #include <util/KernelReferenceable.h>
 #include <util/list.h>
 
+#include <SupportDefs.h>
+
 
 enum additional_thread_state {
 	THREAD_STATE_FREE_ON_RESCHED = 7, // free the thread structure upon reschedule
@@ -64,6 +66,9 @@ struct select_info;
 struct user_thread;				// defined in libroot/user_thread.h
 struct VMAddressSpace;
 struct xsi_sem_context;			// defined in xsi_semaphore.cpp
+struct LockedPages;
+
+typedef DoublyLinkedList<LockedPages> LockedPagesList;
 
 namespace Scheduler {
 	struct ThreadData;
@@ -237,6 +242,8 @@ struct Team : TeamThreadIteratorEntry<team_id>, KernelReferenceable,
 	struct team_death_entry *death_entry;	// protected by fLock
 	struct list		dead_threads;
 
+	LockedPagesList	locked_pages_list;
+
 	// protected by the team's fLock
 	team_dead_children dead_children;
 	team_job_control_children stopped_children;

headers/private/kernel/vm/vm.h

@@ -175,6 +175,9 @@ status_t _user_memory_advice(void* address, size_t size, uint32 advice);
 status_t _user_get_memory_properties(team_id teamID, const void *address,
 			uint32 *_protected, uint32 *_lock);
 
+status_t _user_mlock(const void* address, size_t size);
+status_t _user_munlock(const void* address, size_t size);
+
 area_id _user_area_for(void *address);
 area_id _user_find_area(const char *name);
 status_t _user_get_area_info(area_id area, area_info *info);

headers/private/system/syscalls.h

@@ -448,6 +448,9 @@ extern status_t		_kern_memory_advice(void *address, size_t size,
 extern status_t		_kern_get_memory_properties(team_id teamID,
 						const void *address, uint32* _protected, uint32* _lock);
 
+extern status_t		_kern_mlock(const void* address, size_t size);
+extern status_t		_kern_munlock(const void* address, size_t size);
+
 /* kernel port functions */
 extern port_id		_kern_create_port(int32 queue_length, const char *name);
 extern status_t		_kern_close_port(port_id id);