LibGUI+Kernel: Add a GLock class (userspace mutex.)

It's basically a userspace port of the kernel's Lock class.
Added gettid() and donate() syscalls to support the timeslice donation
feature we already enjoyed in the kernel.

4 files changed, 17 insertions, 1 deletions

diff --git a/LibC/errno_numbers.h b/LibC/errno_numbers.h
index 710982f205..2527d44e97 100644
--- a/LibC/errno_numbers.h
+++ b/LibC/errno_numbers.h
@@ -70,4 +70,5 @@
 #define ETIMEDOUT       67
 #define EPROTOTYPE      68
 #define EINPROGRESS     69
-#define EMAXERRNO       70
+#define ENOTHREAD       70
+#define EMAXERRNO       71
diff --git a/LibC/string.cpp b/LibC/string.cpp
index 02a5dba3f5..eed302db5f 100644
--- a/LibC/string.cpp
+++ b/LibC/string.cpp
@@ -312,6 +312,7 @@ const char* sys_errlist[] = {
     "Timed out",
     "Wrong protocol type",
     "Operation in progress",
+    "No such thread",
     "The highest errno +1 :^)",
 };
 
diff --git a/LibC/unistd.cpp b/LibC/unistd.cpp
index 9082d5d92a..6d820d6646 100644
--- a/LibC/unistd.cpp
+++ b/LibC/unistd.cpp
@@ -421,4 +421,16 @@ int ftruncate(int fd, off_t length)
     ASSERT_NOT_REACHED();
 }
 
+int gettid()
+{
+    int rc = syscall(SC_gettid);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int donate(int tid)
+{
+    int rc = syscall(SC_donate, tid);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
 }
diff --git a/LibC/unistd.h b/LibC/unistd.h
index 5f38e15b63..9114572fdc 100644
--- a/LibC/unistd.h
+++ b/LibC/unistd.h
@@ -14,6 +14,8 @@ __BEGIN_DECLS
 
 extern char** environ;
 
+int gettid();
+int donate(int tid);
 int create_thread(int(*)(void*), void*);
 int create_shared_buffer(pid_t peer_pid, int, void** buffer);
 void* get_shared_buffer(int shared_buffer_id);