First pass at message syscalls

src/kernel/process.cpp

@@ -1,28 +1,65 @@
 #include "process.h"
+#include "scheduler.h"
 
 
-void
+bool
 process::wait_on_signal(uint64_t sigmask)
 {
 	waiting = process_wait::signal;
 	waiting_info = sigmask;
 	flags -= process_flags::ready;
+	return true;
 }
 
-void
+bool
 process::wait_on_child(uint32_t pid)
 {
 	waiting = process_wait::child;
 	waiting_info = pid;
 	flags -= process_flags::ready;
+	return true;
 }
 
-void
+bool
 process::wait_on_time(uint64_t time)
 {
 	waiting = process_wait::time;
 	waiting_info = time;
 	flags -= process_flags::ready;
+	return true;
+}
+
+bool
+process::wait_on_send(uint32_t target_id)
+{
+	scheduler &s = scheduler::get();
+	process *target = s.get_process_by_id(target_id);
+	if (!target) return false;
+
+	if (!target->wake_on_receive(this)) {
+		waiting = process_wait::send;
+		waiting_info = target_id;
+		flags -= process_flags::ready;
+	}
+
+	return true;
+}
+
+bool
+process::wait_on_receive(uint32_t source_id)
+{
+	scheduler &s = scheduler::get();
+	process *source = s.get_process_by_id(source_id);
+	if (!source) return false;
+
+	if (!source->wake_on_send(this)) {
+		waiting = process_wait::receive;
+		waiting_info = source_id;
+		flags -= process_flags::ready;
+		return true;
+	}
+
+	return false;
 }
 
 bool
@@ -49,7 +86,6 @@ process::wake_on_child(process *child)
 	return true;
 }
 
-
 bool
 process::wake_on_time(uint64_t now)
 {
@@ -62,3 +98,28 @@ process::wake_on_time(uint64_t now)
 	return true;
 }
 
+bool
+process::wake_on_send(process *target)
+{
+	if (waiting != process_wait::send ||
+		waiting_info != target->pid)
+		return false;
+
+	waiting = process_wait::none;
+	flags += process_flags::ready;
+	return true;
+}
+
+
+bool
+process::wake_on_receive(process *source)
+{
+	if (waiting != process_wait::receive ||
+		waiting_info != source->pid)
+		return false;
+
+	waiting = process_wait::none;
+	flags += process_flags::ready;
+	return true;
+}
+