Index: src/libcfa/Makefile.am
===================================================================
--- src/libcfa/Makefile.am	(revision 3fddc6bf787ed96dcd56feef11587519e7092466)
+++ src/libcfa/Makefile.am	(revision eac73ebda3e8c9c54559c1e3023f21189bf6a631)
@@ -44,5 +44,5 @@
 # not all platforms support concurrency, add option do disable it
 if BUILD_CONCURRENCY
-headers += containers/vector concurrency/coroutines concurrency/threads concurrency/kernel
+headers += containers/vector concurrency/coroutines concurrency/threads concurrency/kernel concurrency/monitor
 endif
 
Index: src/libcfa/Makefile.in
===================================================================
--- src/libcfa/Makefile.in	(revision 3fddc6bf787ed96dcd56feef11587519e7092466)
+++ src/libcfa/Makefile.in	(revision eac73ebda3e8c9c54559c1e3023f21189bf6a631)
@@ -43,5 +43,5 @@
 
 # not all platforms support concurrency, add option do disable it
-@BUILD_CONCURRENCY_TRUE@am__append_3 = containers/vector concurrency/coroutines concurrency/threads concurrency/kernel
+@BUILD_CONCURRENCY_TRUE@am__append_3 = containers/vector concurrency/coroutines concurrency/threads concurrency/kernel concurrency/monitor
 
 # not all platforms support concurrency, add option do disable it
@@ -101,10 +101,12 @@
 	containers/vector.c concurrency/coroutines.c \
 	concurrency/threads.c concurrency/kernel.c \
-	concurrency/CtxSwitch-@MACHINE_TYPE@.S concurrency/invoke.c
+	concurrency/monitor.c concurrency/CtxSwitch-@MACHINE_TYPE@.S \
+	concurrency/invoke.c
 am__dirstamp = $(am__leading_dot)dirstamp
 @BUILD_CONCURRENCY_TRUE@am__objects_1 = containers/libcfa_d_a-vector.$(OBJEXT) \
 @BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_d_a-coroutines.$(OBJEXT) \
 @BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_d_a-threads.$(OBJEXT) \
-@BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_d_a-kernel.$(OBJEXT)
+@BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_d_a-kernel.$(OBJEXT) \
+@BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_d_a-monitor.$(OBJEXT)
 am__objects_2 = libcfa_d_a-limits.$(OBJEXT) \
 	libcfa_d_a-stdlib.$(OBJEXT) libcfa_d_a-math.$(OBJEXT) \
@@ -124,10 +126,12 @@
 	containers/vector.c concurrency/coroutines.c \
 	concurrency/threads.c concurrency/kernel.c \
-	concurrency/CtxSwitch-@MACHINE_TYPE@.S concurrency/invoke.c
+	concurrency/monitor.c concurrency/CtxSwitch-@MACHINE_TYPE@.S \
+	concurrency/invoke.c
 @BUILD_CONCURRENCY_TRUE@am__objects_5 =  \
 @BUILD_CONCURRENCY_TRUE@	containers/libcfa_a-vector.$(OBJEXT) \
 @BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_a-coroutines.$(OBJEXT) \
 @BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_a-threads.$(OBJEXT) \
-@BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_a-kernel.$(OBJEXT)
+@BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_a-kernel.$(OBJEXT) \
+@BUILD_CONCURRENCY_TRUE@	concurrency/libcfa_a-monitor.$(OBJEXT)
 am__objects_6 = libcfa_a-limits.$(OBJEXT) libcfa_a-stdlib.$(OBJEXT) \
 	libcfa_a-math.$(OBJEXT) libcfa_a-iostream.$(OBJEXT) \
@@ -172,5 +176,6 @@
 	fstream iterator rational assert containers/vector \
 	concurrency/coroutines concurrency/threads concurrency/kernel \
-	${shell echo stdhdr/*} concurrency/invoke.h
+	concurrency/monitor ${shell echo stdhdr/*} \
+	concurrency/invoke.h
 HEADERS = $(nobase_cfa_include_HEADERS)
 ETAGS = etags
@@ -398,4 +403,6 @@
 concurrency/libcfa_d_a-kernel.$(OBJEXT): concurrency/$(am__dirstamp) \
 	concurrency/$(DEPDIR)/$(am__dirstamp)
+concurrency/libcfa_d_a-monitor.$(OBJEXT): concurrency/$(am__dirstamp) \
+	concurrency/$(DEPDIR)/$(am__dirstamp)
 concurrency/CtxSwitch-@MACHINE_TYPE@.$(OBJEXT):  \
 	concurrency/$(am__dirstamp) \
@@ -416,4 +423,6 @@
 concurrency/libcfa_a-kernel.$(OBJEXT): concurrency/$(am__dirstamp) \
 	concurrency/$(DEPDIR)/$(am__dirstamp)
+concurrency/libcfa_a-monitor.$(OBJEXT): concurrency/$(am__dirstamp) \
+	concurrency/$(DEPDIR)/$(am__dirstamp)
 concurrency/libcfa_a-invoke.$(OBJEXT): concurrency/$(am__dirstamp) \
 	concurrency/$(DEPDIR)/$(am__dirstamp)
@@ -429,8 +438,10 @@
 	-rm -f concurrency/libcfa_a-invoke.$(OBJEXT)
 	-rm -f concurrency/libcfa_a-kernel.$(OBJEXT)
+	-rm -f concurrency/libcfa_a-monitor.$(OBJEXT)
 	-rm -f concurrency/libcfa_a-threads.$(OBJEXT)
 	-rm -f concurrency/libcfa_d_a-coroutines.$(OBJEXT)
 	-rm -f concurrency/libcfa_d_a-invoke.$(OBJEXT)
 	-rm -f concurrency/libcfa_d_a-kernel.$(OBJEXT)
+	-rm -f concurrency/libcfa_d_a-monitor.$(OBJEXT)
 	-rm -f concurrency/libcfa_d_a-threads.$(OBJEXT)
 	-rm -f containers/libcfa_a-vector.$(OBJEXT)
@@ -462,8 +473,10 @@
 @AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_a-invoke.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_a-kernel.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_a-monitor.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_a-threads.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_d_a-coroutines.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_d_a-invoke.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_d_a-kernel.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_d_a-monitor.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@concurrency/$(DEPDIR)/libcfa_d_a-threads.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@containers/$(DEPDIR)/libcfa_a-vector.Po@am__quote@
@@ -677,4 +690,18 @@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_d_a_CFLAGS) $(CFLAGS) -c -o concurrency/libcfa_d_a-kernel.obj `if test -f 'concurrency/kernel.c'; then $(CYGPATH_W) 'concurrency/kernel.c'; else $(CYGPATH_W) '$(srcdir)/concurrency/kernel.c'; fi`
 
+concurrency/libcfa_d_a-monitor.o: concurrency/monitor.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_d_a_CFLAGS) $(CFLAGS) -MT concurrency/libcfa_d_a-monitor.o -MD -MP -MF concurrency/$(DEPDIR)/libcfa_d_a-monitor.Tpo -c -o concurrency/libcfa_d_a-monitor.o `test -f 'concurrency/monitor.c' || echo '$(srcdir)/'`concurrency/monitor.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) concurrency/$(DEPDIR)/libcfa_d_a-monitor.Tpo concurrency/$(DEPDIR)/libcfa_d_a-monitor.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='concurrency/monitor.c' object='concurrency/libcfa_d_a-monitor.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_d_a_CFLAGS) $(CFLAGS) -c -o concurrency/libcfa_d_a-monitor.o `test -f 'concurrency/monitor.c' || echo '$(srcdir)/'`concurrency/monitor.c
+
+concurrency/libcfa_d_a-monitor.obj: concurrency/monitor.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_d_a_CFLAGS) $(CFLAGS) -MT concurrency/libcfa_d_a-monitor.obj -MD -MP -MF concurrency/$(DEPDIR)/libcfa_d_a-monitor.Tpo -c -o concurrency/libcfa_d_a-monitor.obj `if test -f 'concurrency/monitor.c'; then $(CYGPATH_W) 'concurrency/monitor.c'; else $(CYGPATH_W) '$(srcdir)/concurrency/monitor.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) concurrency/$(DEPDIR)/libcfa_d_a-monitor.Tpo concurrency/$(DEPDIR)/libcfa_d_a-monitor.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='concurrency/monitor.c' object='concurrency/libcfa_d_a-monitor.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_d_a_CFLAGS) $(CFLAGS) -c -o concurrency/libcfa_d_a-monitor.obj `if test -f 'concurrency/monitor.c'; then $(CYGPATH_W) 'concurrency/monitor.c'; else $(CYGPATH_W) '$(srcdir)/concurrency/monitor.c'; fi`
+
 concurrency/libcfa_d_a-invoke.obj: concurrency/invoke.c
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_d_a_CFLAGS) $(CFLAGS) -MT concurrency/libcfa_d_a-invoke.obj -MD -MP -MF concurrency/$(DEPDIR)/libcfa_d_a-invoke.Tpo -c -o concurrency/libcfa_d_a-invoke.obj `if test -f 'concurrency/invoke.c'; then $(CYGPATH_W) 'concurrency/invoke.c'; else $(CYGPATH_W) '$(srcdir)/concurrency/invoke.c'; fi`
@@ -858,4 +885,18 @@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_a_CFLAGS) $(CFLAGS) -c -o concurrency/libcfa_a-kernel.obj `if test -f 'concurrency/kernel.c'; then $(CYGPATH_W) 'concurrency/kernel.c'; else $(CYGPATH_W) '$(srcdir)/concurrency/kernel.c'; fi`
+
+concurrency/libcfa_a-monitor.o: concurrency/monitor.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_a_CFLAGS) $(CFLAGS) -MT concurrency/libcfa_a-monitor.o -MD -MP -MF concurrency/$(DEPDIR)/libcfa_a-monitor.Tpo -c -o concurrency/libcfa_a-monitor.o `test -f 'concurrency/monitor.c' || echo '$(srcdir)/'`concurrency/monitor.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) concurrency/$(DEPDIR)/libcfa_a-monitor.Tpo concurrency/$(DEPDIR)/libcfa_a-monitor.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='concurrency/monitor.c' object='concurrency/libcfa_a-monitor.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_a_CFLAGS) $(CFLAGS) -c -o concurrency/libcfa_a-monitor.o `test -f 'concurrency/monitor.c' || echo '$(srcdir)/'`concurrency/monitor.c
+
+concurrency/libcfa_a-monitor.obj: concurrency/monitor.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_a_CFLAGS) $(CFLAGS) -MT concurrency/libcfa_a-monitor.obj -MD -MP -MF concurrency/$(DEPDIR)/libcfa_a-monitor.Tpo -c -o concurrency/libcfa_a-monitor.obj `if test -f 'concurrency/monitor.c'; then $(CYGPATH_W) 'concurrency/monitor.c'; else $(CYGPATH_W) '$(srcdir)/concurrency/monitor.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) concurrency/$(DEPDIR)/libcfa_a-monitor.Tpo concurrency/$(DEPDIR)/libcfa_a-monitor.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='concurrency/monitor.c' object='concurrency/libcfa_a-monitor.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libcfa_a_CFLAGS) $(CFLAGS) -c -o concurrency/libcfa_a-monitor.obj `if test -f 'concurrency/monitor.c'; then $(CYGPATH_W) 'concurrency/monitor.c'; else $(CYGPATH_W) '$(srcdir)/concurrency/monitor.c'; fi`
 
 concurrency/libcfa_a-invoke.obj: concurrency/invoke.c