Add very simple gang scheduler.

configure

@@ -3851,7 +3851,7 @@ if test "${with_proctrack+set}" = set; then
 fi;
       if test -f "$PROCTRACKDIR/lib/proctrackext.exp"; then
-	 PROCTRACKDIR="$PROCTRACKDIR/lib"
+         PROCTRACKDIR="$PROCTRACKDIR/lib"
          CPPFLAGS="-I$PROCTRACKDIR/include $CPPFLAGS"
@@ -25868,7 +25868,7 @@ _ACEOF
-                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ac_config_files="$ac_config_files Makefile config.xml auxdir/Makefile src/Makefile src/api/Makefile src/common/Makefile src/sacct/Makefile src/salloc/Makefile src/sbatch/Makefile src/sattach/Makefile src/srun/Makefile src/slaunch/Makefile src/slurmd/Makefile src/slurmd/slurmd/Makefile src/slurmd/slurmstepd/Makefile src/slurmctld/Makefile src/sbcast/Makefile src/scontrol/Makefile src/scancel/Makefile src/squeue/Makefile src/sinfo/Makefile src/smap/Makefile src/sview/Makefile src/plugins/Makefile src/plugins/auth/Makefile src/plugins/auth/authd/Makefile src/plugins/auth/munge/Makefile src/plugins/auth/none/Makefile src/plugins/checkpoint/Makefile src/plugins/checkpoint/aix/Makefile src/plugins/checkpoint/none/Makefile src/plugins/jobacct/Makefile src/plugins/jobacct/linux/Makefile src/plugins/jobacct/aix/Makefile src/plugins/jobacct/none/Makefile src/plugins/jobcomp/Makefile src/plugins/jobcomp/filetxt/Makefile src/plugins/jobcomp/none/Makefile src/plugins/jobcomp/script/Makefile src/plugins/proctrack/Makefile src/plugins/proctrack/aix/Makefile src/plugins/proctrack/pgid/Makefile src/plugins/proctrack/linuxproc/Makefile src/plugins/proctrack/rms/Makefile src/plugins/proctrack/sgi_job/Makefile src/plugins/sched/Makefile src/plugins/sched/backfill/Makefile src/plugins/sched/builtin/Makefile src/plugins/sched/hold/Makefile src/plugins/sched/wiki2/Makefile src/plugins/select/Makefile src/plugins/select/bluegene/Makefile src/plugins/select/bluegene/block_allocator/Makefile src/plugins/select/bluegene/plugin/Makefile src/plugins/select/linear/Makefile src/plugins/select/cons_res/Makefile src/plugins/switch/Makefile src/plugins/switch/elan/Makefile src/plugins/switch/none/Makefile src/plugins/switch/federation/Makefile src/plugins/mpi/Makefile src/plugins/mpi/mpichgm/Makefile src/plugins/mpi/mvapich/Makefile src/plugins/mpi/lam/Makefile src/plugins/mpi/none/Makefile src/plugins/task/Makefile src/plugins/task/affinity/Makefile src/plugins/task/none/Makefile doc/Makefile doc/man/Makefile doc/html/Makefile doc/html/configurator.html testsuite/Makefile testsuite/expect/Makefile testsuite/slurm_unit/Makefile testsuite/slurm_unit/common/Makefile testsuite/slurm_unit/slurmctld/Makefile testsuite/slurm_unit/slurmd/Makefile testsuite/slurm_unit/api/Makefile testsuite/slurm_unit/api/manual/Makefile"
+                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          ac_config_files="$ac_config_files Makefile config.xml auxdir/Makefile src/Makefile src/api/Makefile src/common/Makefile src/sacct/Makefile src/salloc/Makefile src/sbatch/Makefile src/sattach/Makefile src/srun/Makefile src/slaunch/Makefile src/slurmd/Makefile src/slurmd/slurmd/Makefile src/slurmd/slurmstepd/Makefile src/slurmctld/Makefile src/sbcast/Makefile src/scontrol/Makefile src/scancel/Makefile src/squeue/Makefile src/sinfo/Makefile src/smap/Makefile src/sview/Makefile src/plugins/Makefile src/plugins/auth/Makefile src/plugins/auth/authd/Makefile src/plugins/auth/munge/Makefile src/plugins/auth/none/Makefile src/plugins/checkpoint/Makefile src/plugins/checkpoint/aix/Makefile src/plugins/checkpoint/none/Makefile src/plugins/jobacct/Makefile src/plugins/jobacct/linux/Makefile src/plugins/jobacct/aix/Makefile src/plugins/jobacct/none/Makefile src/plugins/jobcomp/Makefile src/plugins/jobcomp/filetxt/Makefile src/plugins/jobcomp/none/Makefile src/plugins/jobcomp/script/Makefile src/plugins/proctrack/Makefile src/plugins/proctrack/aix/Makefile src/plugins/proctrack/pgid/Makefile src/plugins/proctrack/linuxproc/Makefile src/plugins/proctrack/rms/Makefile src/plugins/proctrack/sgi_job/Makefile src/plugins/sched/Makefile src/plugins/sched/backfill/Makefile src/plugins/sched/builtin/Makefile src/plugins/sched/gang/Makefile src/plugins/sched/hold/Makefile src/plugins/sched/wiki2/Makefile src/plugins/select/Makefile src/plugins/select/bluegene/Makefile src/plugins/select/bluegene/block_allocator/Makefile src/plugins/select/bluegene/plugin/Makefile src/plugins/select/linear/Makefile src/plugins/select/cons_res/Makefile src/plugins/switch/Makefile src/plugins/switch/elan/Makefile src/plugins/switch/none/Makefile src/plugins/switch/federation/Makefile src/plugins/mpi/Makefile src/plugins/mpi/mpichgm/Makefile src/plugins/mpi/mvapich/Makefile src/plugins/mpi/lam/Makefile src/plugins/mpi/none/Makefile src/plugins/task/Makefile src/plugins/task/affinity/Makefile src/plugins/task/none/Makefile doc/Makefile doc/man/Makefile doc/html/Makefile doc/html/configurator.html testsuite/Makefile testsuite/expect/Makefile testsuite/slurm_unit/Makefile testsuite/slurm_unit/common/Makefile testsuite/slurm_unit/slurmctld/Makefile testsuite/slurm_unit/slurmd/Makefile testsuite/slurm_unit/api/Makefile testsuite/slurm_unit/api/manual/Makefile"
 cat >confcache <<\_ACEOF
@@ -26594,6 +26594,7 @@ do
   "src/plugins/sched/Makefile" ) CONFIG_FILES="$CONFIG_FILES src/plugins/sched/Makefile" ;;
   "src/plugins/sched/backfill/Makefile" ) CONFIG_FILES="$CONFIG_FILES src/plugins/sched/backfill/Makefile" ;;
   "src/plugins/sched/builtin/Makefile" ) CONFIG_FILES="$CONFIG_FILES src/plugins/sched/builtin/Makefile" ;;
+  "src/plugins/sched/gang/Makefile" ) CONFIG_FILES="$CONFIG_FILES src/plugins/sched/gang/Makefile" ;;
   "src/plugins/sched/hold/Makefile" ) CONFIG_FILES="$CONFIG_FILES src/plugins/sched/hold/Makefile" ;;
   "src/plugins/sched/wiki2/Makefile" ) CONFIG_FILES="$CONFIG_FILES src/plugins/sched/wiki2/Makefile" ;;
   "src/plugins/select/Makefile" ) CONFIG_FILES="$CONFIG_FILES src/plugins/select/Makefile" ;;

configure.ac

@@ -281,6 +281,7 @@ AC_CONFIG_FILES([Makefile
 		 src/plugins/sched/Makefile
 		 src/plugins/sched/backfill/Makefile
 		 src/plugins/sched/builtin/Makefile
+		 src/plugins/sched/gang/Makefile
 		 src/plugins/sched/hold/Makefile
 		 src/plugins/sched/wiki2/Makefile
 		 src/plugins/select/Makefile

src/plugins/sched/Makefile.am

 # Makefile for scheduler plugins
 
-SUBDIRS = backfill builtin hold wiki2
+SUBDIRS = backfill builtin gang hold wiki2

src/plugins/sched/Makefile.in

@@ -254,7 +254,7 @@ target_alias = @target_alias@
 target_cpu = @target_cpu@
 target_os = @target_os@
 target_vendor = @target_vendor@
-SUBDIRS = backfill builtin hold wiki2
+SUBDIRS = backfill builtin gang hold wiki2
 all: all-recursive
 
 .SUFFIXES:

src/plugins/sched/gang/Makefile.am

+# Makefile for gang scheduler plugin
+
+AUTOMAKE_OPTIONS = foreign
+
+CXXFLAGS = -fexceptions
+
+PLUGIN_FLAGS = -module -avoid-version --export-dynamic 
+
+INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src/common
+
+pkglib_LTLIBRARIES = sched_gang.la
+
+sched_gang_la_SOURCES = \
+	gang.c		\
+	gang.h		\
+	sched_gang.c
+sched_gang_la_LDFLAGS = $(SO_LDFLAGS) $(PLUGIN_FLAGS)

src/plugins/sched/gang/Makefile.in

+# Makefile.in generated by automake 1.9 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004  Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+# Makefile for gang scheduler plugin
+
+SOURCES = $(sched_gang_la_SOURCES)
+
+srcdir = @srcdir@
+top_srcdir = @top_srcdir@
+VPATH = @srcdir@
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+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
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+install_sh_DATA = $(install_sh) -c -m 644
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+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+host_triplet = @host@
+subdir = src/plugins/sched/gang
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+am_sched_gang_la_OBJECTS = gang.lo sched_gang.lo
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+	$(AM_CFLAGS) $(CFLAGS)
+CCLD = $(CC)
+LINK = $(LIBTOOL) --mode=link --tag=CC $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
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+HAVE_AIX_FALSE = @HAVE_AIX_FALSE@
+HAVE_AIX_PROCTRACK_FALSE = @HAVE_AIX_PROCTRACK_FALSE@
+HAVE_AIX_PROCTRACK_TRUE = @HAVE_AIX_PROCTRACK_TRUE@
+HAVE_AIX_TRUE = @HAVE_AIX_TRUE@
+HAVE_ELAN = @HAVE_ELAN@
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+HAVE_FEDERATION = @HAVE_FEDERATION@
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+HAVE_SCHED_SETAFFINITY_FALSE = @HAVE_SCHED_SETAFFINITY_FALSE@
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+AUTOMAKE_OPTIONS = foreign
+PLUGIN_FLAGS = -module -avoid-version --export-dynamic 
+INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src/common
+pkglib_LTLIBRARIES = sched_gang.la
+sched_gang_la_SOURCES = \
+	gang.c		\
+	gang.h		\
+	sched_gang.c
+
+sched_gang_la_LDFLAGS = $(SO_LDFLAGS) $(PLUGIN_FLAGS)
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh \
+		&& exit 0; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign  src/plugins/sched/gang/Makefile'; \
+	cd $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign  src/plugins/sched/gang/Makefile
+.PRECIOUS: Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
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+	esac;
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+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
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+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
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+	@$(NORMAL_INSTALL)
+	test -z "$(pkglibdir)" || $(mkdir_p) "$(DESTDIR)$(pkglibdir)"
+	@list='$(pkglib_LTLIBRARIES)'; for p in $$list; do \
+	  if test -f $$p; then \
+	    f=$(am__strip_dir) \
+	    echo " $(LIBTOOL) --mode=install $(pkglibLTLIBRARIES_INSTALL) $(INSTALL_STRIP_FLAG) '$$p' '$(DESTDIR)$(pkglibdir)/$$f'"; \
+	    $(LIBTOOL) --mode=install $(pkglibLTLIBRARIES_INSTALL) $(INSTALL_STRIP_FLAG) "$$p" "$(DESTDIR)$(pkglibdir)/$$f"; \
+	  else :; fi; \
+	done
+
+uninstall-pkglibLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@set -x; list='$(pkglib_LTLIBRARIES)'; for p in $$list; do \
+	  p=$(am__strip_dir) \
+	  echo " $(LIBTOOL) --mode=uninstall rm -f '$(DESTDIR)$(pkglibdir)/$$p'"; \
+	  $(LIBTOOL) --mode=uninstall rm -f "$(DESTDIR)$(pkglibdir)/$$p"; \
+	done
+
+clean-pkglibLTLIBRARIES:
+	-test -z "$(pkglib_LTLIBRARIES)" || rm -f $(pkglib_LTLIBRARIES)
+	@list='$(pkglib_LTLIBRARIES)'; for p in $$list; do \
+	  dir="`echo $$p | sed -e 's|/[^/]*$$||'`"; \
+	  test "$$dir" != "$$p" || dir=.; \
+	  echo "rm -f \"$${dir}/so_locations\""; \
+	  rm -f "$${dir}/so_locations"; \
+	done
+sched_gang.la: $(sched_gang_la_OBJECTS) $(sched_gang_la_DEPENDENCIES) 
+	$(LINK) -rpath $(pkglibdir) $(sched_gang_la_LDFLAGS) $(sched_gang_la_OBJECTS) $(sched_gang_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
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+.c.obj:
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+@am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/$*.Tpo" "$(DEPDIR)/$*.Plo"; else rm -f "$(DEPDIR)/$*.Tpo"; exit 1; fi
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+@am__fastdepCC_FALSE@	$(LTCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+distclean-libtool:
+	-rm -f libtool
+uninstall-info-am:
+
+ID: $(HEADERS) $(SOURCES) $(LISP) $(TAGS_FILES)
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+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+	  done | \
+	  $(AWK) '    { files[$$0] = 1; } \
+	       END { for (i in files) print i; }'`; \
+	mkid -fID $$unique
+tags: TAGS
+
+TAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
+		$(TAGS_FILES) $(LISP)
+	tags=; \
+	here=`pwd`; \
+	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
+	unique=`for i in $$list; do \
+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+	  done | \
+	  $(AWK) '    { files[$$0] = 1; } \
+	       END { for (i in files) print i; }'`; \
+	if test -z "$(ETAGS_ARGS)$$tags$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	    $$tags $$unique; \
+	fi
+ctags: CTAGS
+CTAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
+		$(TAGS_FILES) $(LISP)
+	tags=; \
+	here=`pwd`; \
+	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
+	unique=`for i in $$list; do \
+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+	  done | \
+	  $(AWK) '    { files[$$0] = 1; } \
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+	     $$tags $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && cd $(top_srcdir) \
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+distdir: $(DISTFILES)
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+	    $(srcdir)/*) file=`echo "$$file" | sed "s|^$$srcdirstrip/||"`;; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir="/$$dir"; \
+	    $(mkdir_p) "$(distdir)$$dir"; \
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+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    fi; \
+	    cp -pR $$d/$$file $(distdir)$$dir || exit 1; \
+	  else \
+	    test -f $(distdir)/$$file \
+	    || cp -p $$d/$$file $(distdir)/$$file \
+	    || exit 1; \
+	  fi; \
+	done
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+	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	  `test -z '$(STRIP)' || \
+	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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+clean-am: clean-generic clean-libtool clean-pkglibLTLIBRARIES \
+	mostlyclean-am
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+	mostlyclean-libtool
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+	distclean-compile distclean-generic distclean-libtool \
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+	uninstall-pkglibLTLIBRARIES
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:

src/plugins/sched/gang/gang.c

+/*****************************************************************************
+ *  gang.c - Gang scheduler functions.
+ *****************************************************************************
+ *  Copyright (C) 2006 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Morris Jette <jette1@llnl.gov>
+ *  UCRL-CODE-217948.
+ *  
+ *  This file is part of SLURM, a resource management program.
+ *  For details, see <http://www.llnl.gov/linux/slurm/>.
+ *  
+ *  SLURM is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free
+ *  Software Foundation; either version 2 of the License, or (at your option)
+ *  any later version.
+ *
+ *  In addition, as a special exception, the copyright holders give permission 
+ *  to link the code of portions of this program with the OpenSSL library under 
+ *  certain conditions as described in each individual source file, and 
+ *  distribute linked combinations including the two. You must obey the GNU 
+ *  General Public License in all respects for all of the code used other than 
+ *  OpenSSL. If you modify file(s) with this exception, you may extend this 
+ *  exception to your version of the file(s), but you are not obligated to do 
+ *  so. If you do not wish to do so, delete this exception statement from your
+ *  version.  If you delete this exception statement from all source files in 
+ *  the program, then also delete it here.
+ *  
+ *  SLURM is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *  
+ *  You should have received a copy of the GNU General Public License along
+ *  with SLURM; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
+\*****************************************************************************/
+
+#include "./gang.h"
+#include "src/common/slurm_protocol_defs.h"
+#include "src/slurmctld/slurmctld.h"
+#include "src/slurmctld/locks.h"
+
+static bool thread_running = false;
+static bool thread_shutdown = false;
+static pthread_mutex_t thread_flag_mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_t gang_thread_id;
+
+/* Global configuration parameters */
+uint16_t multi_prog_level = 2;	/* maximum multi-programming level */
+uint16_t slice_time = 10;	/* seconds */
+
+static bool	_context_switch(void);
+static void *	_gang_thread(void *no_data);
+static int	_gang_resume_job(uint32_t jobid);
+static int	_gang_suspend_job(uint32_t jobid);
+static void	_parse_gang_config(void);
+
+
+/* _parse_gang_config - load gang scheduler configuration parameters.
+ * To read gang.conf configuration file, see _parse_wiki_config
+ * code in src/wiki/msg.c, or add parameters to main config file */
+static void
+_parse_gang_config(void)
+{
+	/* Reset multi_prog_level and slice_time as needed */
+}
+
+static int
+_gang_resume_job(uint32_t jobid)
+{
+	int slurm_rc;
+	suspend_msg_t msg;
+
+	msg.job_id = jobid;
+	msg.op = RESUME_JOB;
+	slurm_rc = job_suspend(&msg, 0, -1);
+	if (slurm_rc != SLURM_SUCCESS)
+		error("gang: Failed to resume job %u (%m)", jobid);
+	else
+		info("gang: Resumed job %u", jobid);
+	return slurm_rc;
+}
+
+static int
+_gang_suspend_job(uint32_t jobid)
+{
+	int slurm_rc;
+	suspend_msg_t msg;
+
+	msg.job_id = jobid;
+	msg.op = SUSPEND_JOB;
+	slurm_rc = job_suspend(&msg, 0, -1);
+	if (slurm_rc != SLURM_SUCCESS)
+		error("gang: Failed to suspend job %u (%m)", jobid);
+	else
+		info("gang: Suspended job %u", jobid);
+	return slurm_rc;
+}
+
+/* _context_switch - This is just a very simple proof of concept sample. 
+ *	The production version needs to maintain an Ousterhout matrix and 
+ *	make intelligent scheduling decisions. This version supports a 
+ *	multi-programming level of 2 only. In practice we'll want a 
+ *	time slice much larger than 10 seconds too, but that's fine for 
+ *	testing. - Moe */
+static bool
+_context_switch(void)
+{
+	bool run_scheduler = false;
+	struct job_record *job_ptr;
+	ListIterator job_iterator;
+
+	job_iterator = list_iterator_create(job_list);
+	while ((job_ptr = (struct job_record *) list_next(job_iterator))) {
+		if (job_ptr->job_state == JOB_RUNNING)
+			_gang_suspend_job(job_ptr->job_id);
+		else if (job_ptr->job_state == JOB_SUSPENDED) {
+			_gang_resume_job(job_ptr->job_id);
+			run_scheduler = true;
+		}
+	}
+	list_iterator_destroy(job_iterator);
+	return run_scheduler;
+}
+
+/* _gang_thread - A pthread to periodically perform gang scheduler context 
+ *	switches. */
+static void *
+_gang_thread(void *no_data)
+{
+	bool run_scheduler;
+
+	/* Locks: write job and node info */
+	slurmctld_lock_t job_write_lock = {
+		NO_LOCK, WRITE_LOCK, WRITE_LOCK, NO_LOCK };
+
+	while (!thread_shutdown) {
+		lock_slurmctld(job_write_lock);
+		run_scheduler = _context_switch();
+		unlock_slurmctld(job_write_lock);
+		if (run_scheduler)
+			schedule();	/* has own locking */
+		sleep(slice_time);
+	}
+	pthread_exit((void *) 0);
+}
+
+/*
+ * spawn_gang_thread - Create a pthread to perform gang scheduler actions
+ *
+ * NOTE: Create only one pthread in any plugin. Some systems leak memory on 
+ * each pthread_create from within a plugin
+ */
+extern int
+spawn_gang_thread(void)
+{
+	pthread_attr_t thread_attr_msg;
+
+	pthread_mutex_lock( &thread_flag_mutex );
+	if (thread_running) {
+		error("gang thread already running, not starting another");
+		pthread_mutex_unlock(&thread_flag_mutex);
+		return SLURM_ERROR;
+	}
+
+	_parse_gang_config();
+	slurm_attr_init(&thread_attr_msg);
+	if (pthread_create(&gang_thread_id, &thread_attr_msg, 
+			_gang_thread, NULL))
+		fatal("pthread_create %m");
+
+	slurm_attr_destroy(&thread_attr_msg);
+	thread_running = true;
+	pthread_mutex_unlock(&thread_flag_mutex);
+	return SLURM_SUCCESS;
+}
+
+extern void
+term_gang_thread(void)
+{
+	pthread_mutex_lock(&thread_flag_mutex);
+	if (thread_running) {
+		int i;
+		thread_shutdown = true;
+		for (i=0; i<4; i++) {
+			if (pthread_cancel(gang_thread_id)) {
+				gang_thread_id = 0;
+				break;
+			}
+			usleep(1000);
+		}
+		if (gang_thread_id)
+			error("Cound not kill gang pthread");
+	}
+	pthread_mutex_unlock(&thread_flag_mutex);
+}
+

src/plugins/sched/gang/gang.h

+/*****************************************************************************\
+ *  gang.h - Gang scheduler definitions
+ *****************************************************************************
+ *  Copyright (C) 2006 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Morris Jette <jette1@llnl.gov>
+ *  UCRL-CODE-217948.
+ *  
+ *  This file is part of SLURM, a resource management program.
+ *  For details, see <http://www.llnl.gov/linux/slurm/>.
+ *  
+ *  SLURM is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free
+ *  Software Foundation; either version 2 of the License, or (at your option)
+ *  any later version.
+ *
+ *  In addition, as a special exception, the copyright holders give permission 
+ *  to link the code of portions of this program with the OpenSSL library under 
+ *  certain conditions as described in each individual source file, and 
+ *  distribute linked combinations including the two. You must obey the GNU 
+ *  General Public License in all respects for all of the code used other than 
+ *  OpenSSL. If you modify file(s) with this exception, you may extend this 
+ *  exception to your version of the file(s), but you are not obligated to do 
+ *  so. If you do not wish to do so, delete this exception statement from your
+ *  version.  If you delete this exception statement from all source files in 
+ *  the program, then also delete it here.
+ *  
+ *  SLURM is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *  
+ *  You should have received a copy of the GNU General Public License along
+ *  with SLURM; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
+\*****************************************************************************/
+
+#ifndef __SCHED_GANG_H
+#define __SCHED_GANG_H
+
+#include <stdio.h>
+#include <slurm/slurm_errno.h>
+
+#include "src/common/plugin.h"
+#include "src/common/log.h"
+
+extern int	spawn_gang_thread(void);
+extern void	term_gang_thread(void);
+
+#endif

src/plugins/sched/gang/sched_gang.c

+/*****************************************************************************\
+ *  sched_gang.c - Gang scheduler plugin functions.
+ *****************************************************************************
+ *  Copyright (C) 2006 The Regents of the University of California.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Morris Jette <jette1@llnl.gov>
+ *  UCRL-CODE-217948.
+ *  
+ *  This file is part of SLURM, a resource management program.
+ *  For details, see <http://www.llnl.gov/linux/slurm/>.
+ *  
+ *  SLURM is free software; you can redistribute it and/or modify it under
+ *  the terms of the GNU General Public License as published by the Free
+ *  Software Foundation; either version 2 of the License, or (at your option)
+ *  any later version.
+ *
+ *  In addition, as a special exception, the copyright holders give permission 
+ *  to link the code of portions of this program with the OpenSSL library under 
+ *  certain conditions as described in each individual source file, and 
+ *  distribute linked combinations including the two. You must obey the GNU 
+ *  General Public License in all respects for all of the code used other than 
+ *  OpenSSL. If you modify file(s) with this exception, you may extend this 
+ *  exception to your version of the file(s), but you are not obligated to do 
+ *  so. If you do not wish to do so, delete this exception statement from your
+ *  version.  If you delete this exception statement from all source files in 
+ *  the program, then also delete it here.
+ *  
+ *  SLURM is distributed in the hope that it will be useful, but WITHOUT ANY
+ *  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ *  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ *  details.
+ *  
+ *  You should have received a copy of the GNU General Public License along
+ *  with SLURM; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
+\*****************************************************************************/
+
+#include "./gang.h"
+
+const char		plugin_name[]	= "Gang Scheduler plugin";
+const char		plugin_type[]	= "sched/gang";
+const uint32_t		plugin_version	= 90;
+
+/* A plugin-global errno. */
+static int plugin_errno = SLURM_SUCCESS;
+
+/**************************************************************************/
+/*  TAG(                              init                              ) */
+/**************************************************************************/
+extern int init( void )
+{
+	verbose( "gang scheduler plugin loaded" );
+	return spawn_gang_thread();
+}
+
+/**************************************************************************/
+/*  TAG(                              fini                              ) */
+/**************************************************************************/
+extern void fini( void )
+{
+	term_gang_thread();
+}
+
+
+/***************************************************************************/
+/*  TAG(                   slurm_sched_plugin_schedule                   ) */
+/***************************************************************************/
+extern int slurm_sched_plugin_schedule( void )
+{
+	return SLURM_SUCCESS;
+}
+
+
+/**************************************************************************/
+/* TAG(                   slurm_sched_plugin_initial_priority           ) */ 
+/**************************************************************************/
+extern uint32_t slurm_sched_plugin_initial_priority( uint32_t last_prio )
+{
+	if (last_prio >= 2)
+		return (last_prio - 1);
+	else
+		return 1;
+}
+
+/**************************************************************************/
+/* TAG(              slurm_sched_plugin_job_is_pending                  ) */
+/**************************************************************************/
+void slurm_sched_plugin_job_is_pending( void )
+{
+	/* No action required */
+}
+
+/**************************************************************************/
+/* TAG(              slurm_sched_get_errno                              ) */
+/**************************************************************************/
+int slurm_sched_get_errno( void )
+{
+	return plugin_errno;
+}
+
+/**************************************************************************/
+/* TAG(              slurm_sched_strerror                               ) */
+/**************************************************************************/
+char *slurm_sched_strerror( int errnum )
+{
+	return NULL;
+}
+