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Peter Wang 257dcf24ca This patch adds preliminary support for deterministic, dependent

Estimated hours taken: 50
Branches: main

This patch adds preliminary support for deterministic, dependent
parallel conjunctions to the low-level backend.  In other backends
dependent parallel conjunctions are converted into plain conjunctions.

For a parallel conjunction (A & B), if the goal B is dependent on a variable
X which is bound by goal A, we transform the conjunction such that
goal B must wait for the value to be produced by A before it begins
executing.  This transformation is not yet useful in practice (you might as
well use a sequential conjunction).  A later version of this transformation
will move the synchronisation deeper into the goals so that B can execute as
much as possible before it waits for the value from A.

There is no coroutining support yet so if there are not enough threads
available then dependent parallel conjunctions can cause the program to
deadlock.


configure.in:
runtime/mercury_conf.h.in:
	Check for existence of semaphore.h and #define MR_HAVE_SEMAPHORE_H
	if it does.

library/library.m:
library/par_builtin.m:
library/private_builtin.m:
mdbcomp/prim_data.m:
mdbcomp/program_representation.m:
	Add a new module `par_builtin' to hold synchronisation primitives.

compiler/modules.m:
	Import `par_builtin' module in parallel grades.

compiler/dep_par_conj.m:
compiler/transform_hlds.m:
compiler/mercury_compile.m:
	Add a transformation to detect dependent parallel conjunctions
	and insert the necessary synchronisation code.

compiler/hlds_goal.m:
	Consider empty parallel conjunctions as atomic, the same as plain
	conjunctions.

compiler/inlining.m:
	Flatten parallel conjunctions when inlining, as for plain conjunctions.

compiler/live_vars.m:
	Fix build_live_sets_in_par_conj to handle dependent parallel
	conjunctions.

compiler/liveness.m:
	Delay deaths in parallel conjunctions the same way as for plain
	conjunctions.

	Update detect_resume_points_in_par_conj for dependent parallel
	conjunctions.

compiler/mode_util.m:
	Treat parallel and plain conjunctions equally when recomputing instmap
	deltas.

compiler/modes.m:
compiler/unique_modes.m:
	Treat parallel and plain conjunctions equally when checking modes and
	uniqueness.  However, don't flatten parallel conjunctions into plain
	conjunctions and vice versa.

compiler/simplify.m:
	Don't reset instmaps and seen calls after each conjunct of a parallel
	conjunction.

compiler/store_alloc.m:
	Update allocation for dependent parallel conjunctions.

compiler/switch_detection.m:
	Detect switches in parallel conjunctions the same as plain
	conjunctions.

compiler/par_conj_gen.m:
	Add a todo comment.

tests/Mmakefile:
tests/par_conj/.cvsignore:
tests/par_conj/Mmakefile:
tests/par_conj/dep_par_1.m:
tests/par_conj/dep_par_10.m:
tests/par_conj/dep_par_11.m:
tests/par_conj/dep_par_11b.m:
tests/par_conj/dep_par_11c.m:
tests/par_conj/dep_par_12.m:
tests/par_conj/dep_par_13.m:
tests/par_conj/dep_par_14.m:
tests/par_conj/dep_par_14b.m:
tests/par_conj/dep_par_14c.m:
tests/par_conj/dep_par_14d.m:
tests/par_conj/dep_par_16.m:
tests/par_conj/dep_par_17.m:
tests/par_conj/dep_par_18.m:
tests/par_conj/dep_par_2.m:
tests/par_conj/dep_par_20.m:
tests/par_conj/dep_par_21.m:
tests/par_conj/dep_par_22.m:
tests/par_conj/dep_par_23.m:
tests/par_conj/dep_par_3.m:
tests/par_conj/dep_par_3b.m:
tests/par_conj/dep_par_3c.m:
tests/par_conj/dep_par_4.m:
tests/par_conj/dep_par_5.m:
tests/par_conj/dep_par_5b.m:
tests/par_conj/dep_par_5c.m:
tests/par_conj/dep_par_5d.m:
tests/par_conj/dep_par_6.m:
tests/par_conj/dep_par_7.m:
tests/par_conj/dep_par_8.m:
tests/par_conj/dep_par_9.m:
tests/par_conj/indep_par_append.exp:
tests/par_conj/indep_par_append.m:
tests/par_conj/indep_par_nested.exp:
tests/par_conj/indep_par_nested.m:
	Add some parallel conjunction test cases.  The dependent parallel
	conjunction tests are not yet executed as they can deadlock if there
	are not enough threads available.

browser/RESERVED_MACRO_NAMES:
library/RESERVED_MACRO_NAMES:
runtime/RESERVED_MACRO_NAMES:
trace/RESERVED_MACRO_NAMES:
	Add LINUX_THREADS, _REENTRANT and _THREAD_SAFE.

2006-06-28 04:46:26 +00:00

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