From df131ea4f913fea43c266517a154caa08ff9b088 Mon Sep 17 00:00:00 2001
From: Florian Jung <flo@thinkpad.(none)>
Date: Tue, 8 Feb 2011 15:55:59 +0100
Subject: Updated program files are now reloaded automatically

---
 synth/watch_files.cpp | 160 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 synth/watch_files.cpp

(limited to 'synth/watch_files.cpp')

diff --git a/synth/watch_files.cpp b/synth/watch_files.cpp
new file mode 100644
index 0000000..ce80224
--- /dev/null
+++ b/synth/watch_files.cpp
@@ -0,0 +1,160 @@
+#include <iostream>
+#include <pthread.h>
+#include <unistd.h>
+#include <sys/inotify.h>
+
+#include "watch_files.h"
+#include "util.h"
+#include "globals.h"
+#include "in_synth_cli.h"
+
+using namespace std;
+
+int fd=-1;
+map<int, set<int> > inotify_map;
+pthread_mutex_t inotify_map_mutex;
+
+void watch_files_cleanup(void* unused)
+{
+	if (fd==-1)
+	{
+		output_verbose("NOTE: no cleaning necessary for watch-files-thread");
+	}
+	else
+	{
+		output_verbose("NOTE: cleaning up for watch-files-thread...");
+		
+	}
+}
+
+void* watch_files(void* unused)
+{
+	pthread_cleanup_push(watch_files_cleanup, NULL);
+	
+	pthread_mutex_init(&inotify_map_mutex, NULL);
+	
+	fd=inotify_init();
+	if (fd==-1)
+	{
+		output_warning("WARNING: could not initalize inotify. you must inform me about\n"
+									 "         updated files manually.");
+		while (true) sleep(10);
+	}
+	else
+	{
+		for (int i=0;i<128;i++) // add watches for all loaded programs
+			if (programfile[i]!="")
+				add_watch(i);
+		
+		inotify_event ev;
+		size_t s;
+		while (true)
+		{
+			s=read (fd, &ev, sizeof(inotify_event));
+			while (s<sizeof(inotify_event))
+				s+=read (fd,(char*)&ev + s, sizeof(inotify_event)-s);
+			
+			pthread_mutex_lock(&inotify_map_mutex);
+			
+			if (ev.mask & IN_MODIFY)
+			{
+				if (verbose)
+				{
+					string str="";
+					set<int>& tmp=inotify_map[ev.wd];
+					for (set<int>::iterator it=tmp.begin(); it!=tmp.end(); it++)
+						str+="#"+IntToStr(*it)+" ";
+					
+					output_verbose("NOTE: reloading programs "+str+"...");
+				}
+
+				set<int>& tmp=inotify_map[ev.wd];
+				for (set<int>::iterator it=tmp.begin(); it!=tmp.end(); it++)
+					lock_and_load_program_no_watch_updates(*it, programfile[*it]);
+			}
+			else if (ev.mask & (IN_MOVE_SELF | IN_DELETE_SELF))
+			{
+				if (verbose)
+				{
+					string str="";
+					set<int>& tmp=inotify_map[ev.wd];
+					for (set<int>::iterator it=tmp.begin(); it!=tmp.end(); it++)
+						str+="#"+IntToStr(*it)+" ";
+					
+					output_verbose("NOTE: removed watch for programs "+str);
+				}
+				
+				inotify_map.erase(ev.wd);
+				inotify_rm_watch(fd,ev.wd);
+			}
+			else if (ev.mask != IN_IGNORED)
+			{
+				output_note("NOTE: in watch_files-thread: unknown event received ("+IntToStrHex(ev.mask)+")");
+			}
+
+			pthread_mutex_unlock(&inotify_map_mutex);
+		}
+	}
+		
+	pthread_cleanup_pop(0);
+}
+
+void remove_watch(int prog)
+{
+	if (watchfiles)
+	{
+		map<int, set<int> >::iterator mit;
+		set<int>* tmp;
+		set<int>::iterator sit;
+		
+		pthread_mutex_lock(&inotify_map_mutex);
+		
+		//search in all known watch descriptors
+		for (mit=inotify_map.begin(); mit!=inotify_map.end(); mit++)
+		{
+			tmp=&(mit->second);
+			sit=tmp->find(prog);
+			
+			//search for some wd which affects $prog
+			if (sit!=tmp->end()) //found?
+			{
+				//erase $prog from the affect-set
+				tmp->erase(sit);
+				if (tmp->empty())
+				{
+					//if the affect-set is now empty, we can garbage-collect
+					//the wd (i.e., remove it)
+					cout << "garbage collecting wd #"<<mit->first<<endl;
+					inotify_rm_watch(fd, mit->first);
+					inotify_map.erase(mit);
+				}
+				
+				//we're done now
+				break;
+			}
+		}
+		
+		pthread_mutex_unlock(&inotify_map_mutex);
+	}
+}
+
+void add_watch(int prog)
+{
+	if (watchfiles)
+	{
+		int wd=inotify_add_watch(fd, programfile[prog].c_str(), IN_MODIFY | IN_MOVE_SELF | IN_DELETE_SELF);
+		
+		pthread_mutex_lock(&inotify_map_mutex);
+		
+		if (wd!=-1)
+		{
+			inotify_map[wd].insert(prog);
+		}
+		else
+		{
+			//TODO: warning
+		}
+		
+		pthread_mutex_unlock(&inotify_map_mutex);
+	}
+}
-- 
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