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codegen_c_udgram.py
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########################################################################
#
# Code generation module for the coNCePTuaL language:
# C + Unix-domain (i.e., local) sockets
#
# By Scott Pakin <[email protected]>
#
# ----------------------------------------------------------------------
#
#
# Copyright (C) 2015, Los Alamos National Security, LLC
# All rights reserved.
#
# Copyright (2015). Los Alamos National Security, LLC. This software
# was produced under U.S. Government contract DE-AC52-06NA25396
# for Los Alamos National Laboratory (LANL), which is operated by
# Los Alamos National Security, LLC (LANS) for the U.S. Department
# of Energy. The U.S. Government has rights to use, reproduce,
# and distribute this software. NEITHER THE GOVERNMENT NOR LANS
# MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY
# FOR THE USE OF THIS SOFTWARE. If software is modified to produce
# derivative works, such modified software should be clearly marked,
# so as not to confuse it with the version available from LANL.
#
# Additionally, redistribution and use in source and binary forms,
# with or without modification, are permitted provided that the
# following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#
# * Neither the name of Los Alamos National Security, LLC, Los Alamos
# National Laboratory, the U.S. Government, nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY LANS AND CONTRIBUTORS "AS IS" AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LANS OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#
########################################################################
import codegen_c_generic
from ncptl_config import ncptl_config
class NCPTL_CodeGen(codegen_c_generic.NCPTL_CodeGen):
def __init__(self, options=None):
"Initialize the C + Unix sockets code generation module."
codegen_c_generic.NCPTL_CodeGen.__init__(self, options)
self.backend_name = "c_udgram"
self.backend_desc = "C + Unix-domain datagram sockets"
# Add a command-line option to the generated code to enable a
# user to specify the number of tasks.
self.base_global_parameters.append(("NCPTL_TYPE_INT",
"var_num_tasks",
"tasks",
"T",
"Number of tasks to use",
"1"))
# We don't have our own command-line options but we handle
# --help, nevertheless.
for arg in range(0, len(options)):
if options[arg] == "--help":
# Output a help message.
self.show_help()
raise SystemExit, 0
# ---------------------------- #
# Backend-specific helper code #
# ---------------------------- #
def code_reject_nonzero_tag(self, struct, statement):
"Check for a nonzero tag and abort if one is found."
return ["if (%s.tag != 0%s)" % (struct, self.ncptl_int_suffix),
'ncptl_fatal ("The %s backend does not support nonzero tags in %s statements");' % (self.backend_name, statement)]
# ----------- #
# Header code #
# ----------- #
def code_specify_include_files_POST(self, localvars):
"Specify extra header files needed by the c_udgram backend."
includefiles = [
"#include <errno.h>",
"#include <signal.h>",
"#include <sys/socket.h>",
"#include <sys/un.h>",
"#include <sys/ioctl.h>",
"#include <sys/wait.h>"]
if ncptl_config.has_key("HAVE_SYS_SELECT_H"):
self.push("#include <sys/select.h>", includefiles)
return includefiles
def code_define_macros_POST(self, localvars):
"Define some macros to simplify the generated C code."
# Define a filename template to use for our sockets.
definition = [
"/* Define a filename template for this program's sockets. */",
'#define SOCKET_TEMPLATE "c_udgram_XXXXXX"',
""]
# Define a CONC_SYSTEM_ERROR macro that invokes ncptl_fatal()
# with a description or the number of the most recent system
# error. We use strerror() if configure detected it.
# Otherwise, we use sys_errlist[] if configure detected that.
# Otherwise, we simply use errno.
definition.extend([
'/* Define a wrapper for ncptl_fatal() after a system call failure. */',
'#define CONC_SYSTEM_ERROR(MSG) \\',
' do { \\'])
if ncptl_config.has_key("HAVE_STRERROR"):
definition.extend([
' if (strerror(errno)) \\',
' ncptl_fatal (MSG " (%s, errno=%d)", strerror(errno), errno); \\',
' else \\',
' ncptl_fatal (MSG " (errno=%d)", errno); \\'])
elif ncptl_config.has_key("HAVE_DECL_SYS_ERRLIST"):
definition.extend([
' if (errno < sys_nerr) \\',
' ncptl_fatal (MSG " (%s)", sys_errlist[errno]); \\',
' else \\',
' ncptl_fatal (MSG " (errno=%d)", errno); \\'])
else:
definition.extend([
' ncptl_fatal (MSG " (errno=%d)", errno); \\'])
definition.extend([
' } \\',
' while (0)',
''])
# Define a CONC_SET_BLOCKING macro that sets a socket to
# either blocking or nonblocking, as desired.
definition.extend([
"/* Define a macro that sets or resets a socket's blocking state. */",
'#define CONC_SET_BLOCKING(CSTATE, PEER, BLOCKING) \\',
' do { \\',
' int nonblocking = 1 - (BLOCKING); \\',
' if (ioctl ((CSTATE)->channels[PEER], FIONBIO, &nonblocking) == -1) \\',
' CONC_SYSTEM_ERROR ("Failed to toggle a socket\'s blocking state"); \\',
' } \\',
' while (0)'])
return definition
def code_declare_datatypes_POST(self, localvars):
"Declare additional types needed by the c_udgram backend."
newtypes = []
self.pushmany([
"/* Declare a type that encapsulates much of the communication state. */",
"typedef struct {"],
stack=newtypes)
self.code_declare_var(type="int *", name="channels",
comment="Socket connections to each other task",
stack=newtypes)
self.code_declare_var(type="NCPTL_QUEUE **", name="blockedsendQ",
comment="Queue of events corresponding to blocked sends to each destination",
stack=newtypes)
self.code_declare_var(type="NCPTL_QUEUE **", name="blockedrecvQ",
comment="Queue of events corresponding to blocked receives from each source",
stack=newtypes)
self.code_declare_var(type="int", name="sendsblocked",
comment="0=all blockedsendQ[] are empty; 1=nonempty",
stack=newtypes)
self.code_declare_var(type="int", name="recvsblocked",
comment="0=all blockedrecvQ[] are empty; 1=nonempty",
stack=newtypes)
self.pushmany([
"} COMMSTATE;",
"",
"/* Create symbolic names for each set of communication state we plan to use. */",
"typedef enum {",
"COMMSTATE_PT2PT, /* State for point-to-point communication */",
"COMMSTATE_COLL, /* State for collective communication */",
"NUMCHANNELSETS /* Sentinel describing the number of entries in COMMSTATE_TYPES */",
"} COMMSTATE_TYPES;"],
newtypes)
return newtypes
def code_declare_globals_EXTRA(self, localvars):
"Declare additional C global variables needed by the c_udgram backend."
newvars = []
self.code_declare_var(type="COMMSTATE", name="commstate",
arraysize="NUMCHANNELSETS",
comment="Communication state for multiple independent channels",
stack=newvars)
self.code_declare_var(type="int", name="abnormal_exit", rhs="1",
comment="1=exit handler invoked after an abnormal exit; 0=invoked after a normal one",
stack=newvars)
self.code_declare_var(name="maxpacketlen",
comment="Maximum message length that can be transmitted whole",
stack=newvars)
self.code_declare_var(type="NCPTL_QUEUE *", name="alltasksQ",
comment="List of 0, ..., var_num_tasks-1 for all-task synchronization",
stack=newvars)
# Make all declarations static.
static_newvars = []
for var in newvars:
static_newvars.append("static " + var)
return static_newvars
def code_def_init_decls_POST(self, localvars):
"""
Declare C variables needed by code_define_functions_INIT_COMM_3,
code_def_init_msg_mem_PRE, and code_def_init_misc_EXTRA.
"""
newvars = []
self.code_declare_var(type="int", name="cset",
comment="Index into commstate[]",
stack=newvars)
self.code_declare_var(name="taskID", comment="Loop over all task IDs",
stack=newvars)
self.code_declare_var(type="struct sockaddr_un ***", name="socketinfo",
comment="Socket information (e.g., filename) for every socket in channels[][][]",
stack=newvars)
self.code_declare_var(type="char", name="maxpacketlen_str",
arraysize="50", comment="String equivalent of maxpacketlen",
stack=newvars)
return newvars
# --------------------------- #
# Helper-function definitions #
# --------------------------- #
def code_define_functions_PRE(self, localvars):
"Define some point-to-point and collective communication functions."
msgfuncs = []
uses_send = self.events_used.has_key("EV_SEND")
uses_asend = self.events_used.has_key("EV_ASEND")
uses_recv = self.events_used.has_key("EV_RECV")
uses_arecv = self.events_used.has_key("EV_ARECV")
uses_sync = self.events_used.has_key("EV_SYNC")
uses_mcast = self.events_used.has_key("EV_MCAST")
uses_wait = self.events_used.has_key("EV_WAIT")
uses_etime = self.events_used.has_key("EV_ETIME")
uses_reduce = self.events_used.has_key("EV_REDUCE")
# State all function dependencies.
uses_sync = 1 # Currently required by conc_finalize().
if uses_etime:
uses_send = 1
uses_recv = 1
if uses_sync or uses_mcast:
uses_asend = 1
uses_recv = 1
uses_wait = 1
if uses_reduce:
uses_send = 1
uses_arecv = 1
uses_wait = 1
# Define a wrapper for send() with automatic error checking. */
self.pushmany([
"/* Attempt to send data. Abort on error. Return 1 on success,",
" * 0 if the send blocked. */",
"static inline int conc_send_packet (COMMSTATE *cstate, int dest, void *buffer, int packetsize)",
"{"],
stack=msgfuncs)
self.code_declare_var(type="int", name="bytessent",
comment="Number of bytes actually sent",
stack=msgfuncs)
self.pushmany([
"do",
"bytessent = send (cstate->channels[dest], buffer, (size_t) packetsize, 0);",
"while (bytessent == -1 && errno == EINTR);",
"if (bytessent == -1)",
"if (errno == EAGAIN)",
"return 0; /* send() blocked. */",
"else",
'CONC_SYSTEM_ERROR ("Failed to send a message");',
"else",
" /* send() did not block. */",
"if (bytessent != packetsize)",
'ncptl_fatal ("Expected to send %d bytes but actually sent %d bytes",',
"packetsize, bytessent);",
"return 1;",
"}",
""],
stack=msgfuncs)
# Define a wrapper for recv() with automatic error checking.
self.pushmany([
"/* Attempt to send data. Abort on error. Return 1 on success,",
" * 0 if the send blocked. */",
"static inline int conc_receive_packet (COMMSTATE *cstate, int source, void *buffer, int packetsize)",
"{"],
stack=msgfuncs)
self.code_declare_var(type="int", name="bytesreceived",
comment="Number of bytes actually received",
stack=msgfuncs)
self.pushmany([
"do",
"bytesreceived = recv (cstate->channels[source],",
"buffer, packetsize, MSG_WAITALL|MSG_TRUNC);",
"while (bytesreceived == -1 && errno == EINTR);",
"if (bytesreceived == -1)",
"if (errno == EAGAIN)",
"return 0; /* recv() blocked. */",
"else",
'CONC_SYSTEM_ERROR ("Failed to receive a message");',
"else",
" /* recv() did not block. */",
"if (bytesreceived != packetsize)",
'ncptl_fatal ("Expected to receive %d bytes but actually received %d bytes",',
"packetsize, bytesreceived);",
"return 1;",
"}",
""],
stack=msgfuncs)
# Define a function that determines the maximum socket size.
self.pushmany([
"/* Binary search for the largest valid packet length. */",
"static ncptl_int conc_find_max_packet_len (COMMSTATE *cstate)",
"{",],
stack=msgfuncs)
self.code_declare_var(type="int", name="maxsize",
comment="Maximum valid message size",
stack=msgfuncs)
self.code_declare_var(type="int", name="delta",
comment="Change in message size to try next",
stack=msgfuncs)
self.code_declare_var(type="socklen_t", name="intsize", rhs="sizeof(int)",
comment="Number of bytes in maxsize",
stack=msgfuncs)
self.code_declare_var(type="char *", name="msgbuffer",
comment="Buffer used for sending and receiving",
stack=msgfuncs)
self.code_declare_var(type="int", name="bytessent",
comment="Number of bytes actually sent",
stack=msgfuncs)
self.code_declare_var(type="int", name="bytesreceived",
comment="Number of bytes actually received",
stack=msgfuncs)
self.pushmany([
"CONC_SET_BLOCKING (cstate, physrank, 1);",
"if (getsockopt (cstate->channels[physrank], SOL_SOCKET, SO_SNDBUF, &maxsize, &intsize) == -1 ||",
"!maxsize)",
'CONC_SYSTEM_ERROR ("Failed to get a socket parameter");',
"msgbuffer = (char *) ncptl_malloc (maxsize, 0);",
"",
"for (delta=maxsize/2; delta; delta/=2) {",
"do",
"bytessent =",
"send (cstate->channels[physrank], msgbuffer, (size_t) maxsize, 0);",
"while (bytessent == -1 && errno == EINTR);",
"if (bytessent != -1) {",
"do",
"bytesreceived = recv (cstate->channels[physrank], msgbuffer,",
"(size_t) maxsize, MSG_WAITALL | MSG_TRUNC);",
"while (bytesreceived == -1 && errno == EINTR);",
"if (bytesreceived != (int) maxsize)",
'ncptl_fatal ("Expected to receive %d bytes but actually received %d bytes",',
"maxsize, bytesreceived);",
"maxsize += delta;",
"}",
"else",
"maxsize -= delta;",
"}",
"ncptl_free (msgbuffer);",
"CONC_SET_BLOCKING (cstate, physrank, 0);",
"return (maxsize/sizeof(ncptl_int))*sizeof(ncptl_int) - 1;",
"}"],
stack=msgfuncs)
# Define a wait-one function.
if uses_wait:
self.pushmany([
" /* Wait until a specific send/receive request completes.",
" * ASSUMPTION: target_req has not yet completed. */",
"static inline void conc_wait_one (COMMSTATE *cstate, void *target_req)",
"{"],
stack=msgfuncs)
self.code_declare_var(type="struct timeval", name="polltime",
comment="Time structure corresponding to a minimal poll time",
stack=msgfuncs)
self.pushmany([
"",
" /* Alternately complete receives and sends until target_req",
" * is satisfied. */",
"while (1) {"],
stack=msgfuncs)
self.code_declare_var(name="task_ofs",
comment="Offset from our task ID",
stack=msgfuncs)
self.pushmany([
"",
" /* Process each task ID in turn, starting from our own. */",
"for (task_ofs=0; task_ofs<var_num_tasks; task_ofs++) {"],
stack=msgfuncs)
for type, name, rhs, comment in [
("ncptl_int", "taskID", "(physrank+task_ofs) % var_num_tasks", "Task ID to process"),
("ncptl_int", "pendingsends", "ncptl_queue_length (cstate->blockedsendQ[taskID])", "Number of blocked sends"),
("ncptl_int", "pendingrecvs", "ncptl_queue_length (cstate->blockedrecvQ[taskID])", "Number of blocked receives"),
("int", "making_progress", None, "1=a packet was sent/received; 0=we idled")]:
self.code_declare_var(type=type, name=name, rhs=rhs,
comment=comment, stack=msgfuncs)
self.pushmany([
"",
" /* Keep sending from task taskID and/or receiving from task",
" * taskID until we can no longer do so. */",
"making_progress = pendingrecvs || pendingsends;",
"while (making_progress) {"],
stack=msgfuncs)
for type, name, rhs, comment in [
("int", "recvfd", "0", "File descriptor for a receive channel"),
("int", "sendfd", "0", "File descriptor for a send channel"),
("fd_set", "firstrecv", None, "Set containing either recvfd or nothing"),
("fd_set", "firstsend", None, "Set containing either sendfd or nothing"),
("int", "last_fd", "-1", "1 + highest-numbered descriptor on which to select()"),
("CONC_RECV_EVENT *", "recvev", "NULL", "List of blockedrecvQ's contents"),
("CONC_SEND_EVENT *", "sendev", "NULL", "List of blockedsendQ's contents"),
("int", "recv_available", None, "1=recv() won't block; 0=it will"),
("int", "send_available", None, "1=send() won't block; 0=it will")]:
self.code_declare_var(type=type, name=name, rhs=rhs,
comment=comment, stack=msgfuncs)
self.pushmany([
"",
"FD_ZERO (&firstrecv);",
"if (pendingrecvs) {",
"recvev = ncptl_queue_contents (cstate->blockedrecvQ[taskID], 0);",
"recvfd = cstate->channels[recvev->source];",
"FD_SET(recvfd, &firstrecv);",
"last_fd = recvfd>last_fd ? recvfd : last_fd;",
"}",
"FD_ZERO (&firstsend);",
"if (pendingsends) {",
"sendev = ncptl_queue_contents (cstate->blockedsendQ[taskID], 0);",
"sendfd = cstate->channels[sendev->dest];",
"FD_SET(sendfd, &firstsend);",
"last_fd = sendfd>last_fd ? sendfd : last_fd;",
"}",
"polltime.tv_sec = 0;",
"polltime.tv_usec = 1; /* Setting to 0 tends to hog the CPU. */",
"select (last_fd+1, &firstrecv, &firstsend, NULL, &polltime);",
"send_available = sendfd && FD_ISSET(sendfd, &firstsend);",
"recv_available = recvfd && FD_ISSET(recvfd, &firstrecv);",
"if (!send_available && !recv_available)",
" /* Give up if we're blocked on both the send and receive sides. */",
"break;",
"making_progress = 0; /* Assume no progress. */",
"",
" /* Process a pending receive, if any. */",
"if (pendingrecvs && recv_available) {"],
stack=msgfuncs)
self.code_declare_var(type="int", name="packetsize",
rhs="(int) (recvev->size>maxpacketlen ? maxpacketlen : recvev->size)",
comment="Number of bytes to receive per call",
stack=msgfuncs)
self.pushmany([
"",
"if (conc_receive_packet (cstate, recvev->source, recvev->buffer, packetsize)) {",
" /* The receive went through. */",
"making_progress = 1;",
"recvev->buffer = (void *) ((char *)recvev->buffer + packetsize);",
"recvev->size -= packetsize;",
"if (!recvev->size) {",
" /* We received a complete message. */",
"(void) ncptl_queue_pop (cstate->blockedrecvQ[taskID]);",
"if (!--pendingrecvs)",
"ncptl_queue_empty (cstate->blockedrecvQ[taskID]);",
"if (recvev == target_req)",
" /* We finished the one message we care about. */",
"return;",
"}",
"}",
"}",
"",
" /* Process a pending send, if any. */",
"if (pendingsends && send_available) {",
"int packetsize = (int) (sendev->size>maxpacketlen ? maxpacketlen : sendev->size); /* Number of bytes to send per call */",
"if (conc_send_packet (cstate, sendev->dest, sendev->buffer, packetsize)) {",
" /* The send went through. */",
"making_progress = 1;",
"sendev->buffer = (void *) ((char *) sendev->buffer + packetsize);",
"sendev->size -= packetsize;",
"if (!sendev->size) {",
" /* We sent a complete message. */",
"(void) ncptl_queue_pop (cstate->blockedsendQ[taskID]);",
"if (!--pendingsends)",
"ncptl_queue_empty (cstate->blockedsendQ[taskID]);",
"if (sendev == target_req)",
" /* We finished the one message we care about. */",
"return;",
"}",
"}",
"}",
"}",
"}",
"}",
"}"],
stack=msgfuncs)
# Define a wait-all function.
if uses_wait:
self.pushmany([
"/* Wait until all of our blocked sends and receives complete. */",
"static inline void conc_wait_all (COMMSTATE *cstate)",
"{"],
stack=msgfuncs)
self.code_declare_var(name="taskID", comment="Loop over all task IDs",
stack=msgfuncs)
self.pushmany([
"",
" /* Ensure we have something to do. */",
"if (!cstate->sendsblocked && !cstate->recvsblocked)",
"return;",
"",
" /* Await completion from each task in turn -- not very efficient",
" * but we expect var_num_tasks to be small. */",
"for (taskID=0; taskID<var_num_tasks; taskID++) {"],
stack=msgfuncs)
self.code_declare_var(name="pendingsends", comment="Number of blocked sends",
stack=msgfuncs)
self.code_declare_var(name="pendingrecvs", comment="Number of blocked receives",
stack=msgfuncs)
self.pushmany([
"",
" /* Wait for the final send to complete. */",
"pendingsends = ncptl_queue_length (cstate->blockedsendQ[taskID]);",
"if (pendingsends) {"],
stack=msgfuncs)
self.code_declare_var(type="CONC_SEND_EVENT *", name="lastsend",
comment="Task taskID's final pending send",
stack=msgfuncs)
self.pushmany([
"",
"lastsend = (CONC_SEND_EVENT *) ncptl_queue_contents (cstate->blockedsendQ[taskID], 0);",
"lastsend += pendingsends - 1;",
"conc_wait_one (cstate, (void *) lastsend);",
"}",
"",
" /* Wait for the final receive to complete. */",
"pendingrecvs = ncptl_queue_length (cstate->blockedrecvQ[taskID]);",
"if (pendingrecvs) {"],
stack=msgfuncs)
self.code_declare_var(type="CONC_RECV_EVENT *", name="lastrecv",
comment="Task taskID's final pending receive",
stack=msgfuncs)
self.pushmany([
"",
"lastrecv = (CONC_RECV_EVENT *) ncptl_queue_contents (cstate->blockedrecvQ[taskID], 0);",
"lastrecv += pendingrecvs - 1;",
"conc_wait_one (cstate, (void *) lastrecv); /* Wait for the final receive */",
"}",
"}",
"",
" /* Enable send/receive functions to proceed. */",
"cstate->sendsblocked = 0;",
"cstate->recvsblocked = 0;",
"}"],
stack=msgfuncs)
# Define a synchronous send function.
if uses_send:
self.pushmany([
"/* Enqueue a message on a given channel and block until it completes. */",
"static inline void conc_send_msg (COMMSTATE *cstate, CONC_SEND_EVENT *sendev)",
"{"],
stack=msgfuncs)
self.code_declare_var(type="CONC_SEND_EVENT *", name="sendev_copy",
comment="Mutable copy of sendev",
stack=msgfuncs)
self.pushmany([
"cstate->sendsblocked = 1;",
"sendev_copy = (CONC_SEND_EVENT *) ncptl_queue_push (cstate->blockedsendQ[sendev->dest], (void *) sendev);",
"sendev_copy->buffer = (void *) ((char *)sendev_copy->buffer + sendev_copy->bufferofs);",
"conc_wait_one (cstate, sendev_copy);",
"}"],
stack=msgfuncs)
# Define a synchronous receive function.
if uses_recv:
self.pushmany([
"/* Post a receive and block until it completes. */",
"static inline void conc_recv_msg (COMMSTATE *cstate, CONC_RECV_EVENT *recvev)",
"{"],
stack=msgfuncs)
self.code_declare_var(type="CONC_RECV_EVENT *", name="recvev_copy",
comment="Mutable copy of recvev",
stack=msgfuncs)
self.pushmany([
"cstate->recvsblocked = 1;",
"recvev_copy = (CONC_RECV_EVENT *) ncptl_queue_push (cstate->blockedrecvQ[recvev->source], (void *) recvev);",
"recvev_copy->buffer = (void *) ((char *)recvev_copy->buffer + recvev_copy->bufferofs);",
"conc_wait_one (cstate, recvev_copy);",
"}"],
stack=msgfuncs)
# Define an asynchronous send function.
if uses_asend:
self.pushmany([
"/* Enqueue a message on a given channel (nonblocking). */",
"static inline void conc_asend_msg (COMMSTATE *cstate, CONC_SEND_EVENT *sendev)",
"{"],
stack=msgfuncs)
self.code_declare_var(type="CONC_SEND_EVENT *", name="sendev_copy",
comment="Mutable copy of sendev",
stack=msgfuncs)
self.pushmany([
"cstate->sendsblocked = 1;",
"sendev_copy = (CONC_SEND_EVENT *) ncptl_queue_push (cstate->blockedsendQ[sendev->dest], (void *) sendev);",
"sendev_copy->buffer = (void *) ((char *)sendev_copy->buffer + sendev_copy->bufferofs);",
"}"],
stack=msgfuncs)
# Define an asynchronous receive function.
if uses_arecv:
self.pushmany([
"/* Enqueue a receive request on a given channel (nonblocking). */",
"static inline void conc_arecv_msg (COMMSTATE *cstate, CONC_RECV_EVENT *recvev)",
"{"],
stack=msgfuncs)
self.code_declare_var(type="CONC_RECV_EVENT *", name="recvev_copy",
comment="Mutable copy of recvev",
stack=msgfuncs)
self.pushmany([
"cstate->recvsblocked = 1;",
"recvev_copy = (CONC_RECV_EVENT *) ncptl_queue_push (cstate->blockedrecvQ[recvev->source], (void *) recvev);",
"recvev_copy->buffer = (void *) ((char *)recvev_copy->buffer + recvev_copy->bufferofs);",
"}"],
stack=msgfuncs)
# Define a synchronization function.
if uses_sync:
self.pushmany([
"/* Barrier-synchronize a list of tasks using a butterfly pattern. */",
"static inline void conc_synchronize (COMMSTATE *cstate, int *peerlist, ncptl_int maxrank, ncptl_int syncrank)",
"{"],
stack=msgfuncs)
for type, name, comment in [
("ncptl_int", "stage", "Current stage of the butterfly pattern"),
("CONC_SEND_EVENT", "sendev", "Send event to pass to conc_asend_msg()"),
("CONC_RECV_EVENT", "recvev", "Receive event to pass to conc_recv_msg()"),
("ncptl_int", "dummybuffer", "Dummy message buffer")]:
self.code_declare_var(type=type, name=name, comment=comment,
stack=msgfuncs)
# For each peer with a Hamming distance of 1 from us,
# perform a nonblocking send followed by a blocking
# receive.
self.pushmany([
"",
"memset ((void *)&sendev, 0, sizeof(CONC_SEND_EVENT));",
"memset ((void *)&recvev, 0, sizeof(CONC_RECV_EVENT));",
"for (stage=ncptl_func_bits(maxrank)-1; stage>=0; stage--) {"],
stack=msgfuncs)
self.code_declare_var(name="peernum",
rhs="syncrank ^ (1<<stage)",
comment="Offset into peerlist[] of our current peer",
stack=msgfuncs)
self.pushmany([
"if (peernum <= maxrank) {",
"sendev.dest = peerlist[peernum];",
"sendev.buffer = (void *) &dummybuffer;",
"conc_asend_msg (cstate, &sendev);",
"recvev.source = peerlist[peernum];",
"recvev.buffer = (void *) &dummybuffer;",
"conc_recv_msg (cstate, &recvev);",
"conc_wait_all (cstate);",
"}",
"}",
"}"],
stack=msgfuncs)
# Define a multicast function.
if uses_mcast:
self.pushmany([
"/* Multicast data from a single source to a set of destinations. */",
"static void conc_multicast (COMMSTATE *cstate, CONC_MCAST_EVENT *mcast_ev)",
"{"],
stack=msgfuncs)
self.code_declare_var(name="mcastrank",
rhs="mcast_ev->mcastrank",
comment="This task's rank in the multicast",
stack=msgfuncs)
self.code_declare_var(type="int *", name="peerlist",
rhs="(int *) ncptl_queue_contents(mcast_ev->peerqueue, 0)",
comment="List of our peers' physical task numbers",
stack=msgfuncs)
self.code_declare_var(name="maxrank",
rhs="ncptl_queue_length(mcast_ev->peerqueue) - 1",
comment="Number of tasks involved in the multicast",
stack=msgfuncs)
self.code_declare_var(type="CONC_SEND_EVENT", name="sendev",
comment="Send event to pass to conc_asend_msg()",
stack=msgfuncs)
self.code_declare_var(type="CONC_RECV_EVENT", name="recvev",
comment="Receive event to pass to conc_recv_msg()",
stack=msgfuncs)
self.pushmany([
"",
" /* Multicast data in a binary-tree pattern. */",
"memset ((void *)&sendev, 0, sizeof(CONC_SEND_EVENT));",
"sendev.size = mcast_ev->size;"],
stack=msgfuncs)
for field in ["alignment", "buffernum", "bufferofs", "misaligned",
"touching", "verification", "buffer"]:
self.push("sendev.%s = mcast_ev->%s;" % (field, field), msgfuncs)
self.pushmany([
"memset ((void *)&recvev, 0, sizeof(CONC_RECV_EVENT));",
"recvev.size = mcast_ev->size;"],
stack=msgfuncs)
for field in ["alignment", "buffernum", "bufferofs", "misaligned",
"touching", "verification", "buffer"]:
self.push("recvev.%s = mcast_ev->%s;" % (field, field), msgfuncs)
self.pushmany([
"if (mcastrank > 0) {",
" /* Receive synchronously from our parent. */",
"recvev.source = peerlist[(mcastrank-1)/2];",
"conc_recv_msg (cstate, &recvev);",
"}",
"if ((mcastrank+1)*2-1 <= maxrank) {",
" /* Send asynchronously to our left child. */",
"sendev.dest = peerlist[(mcastrank+1)*2 - 1];",
"conc_asend_msg (cstate, &sendev);",
"if ((mcastrank+1)*2 <= maxrank) {",
" /* Send asynchronously to our right child. */",
"sendev.dest = peerlist[(mcastrank+1)*2];",
"conc_asend_msg (cstate, &sendev);",
"}",
"",
" /* Wait for all of our pending sends to complete. */",
"conc_wait_all (cstate);",
"}",
"}"],
stack=msgfuncs)
# Define a reduction function.
if uses_reduce:
self.pushmany([
"/* Reduce data from one set of tasks to another set. */",
"static inline void conc_reduce (COMMSTATE *cstate, CONC_REDUCE_EVENT *reduce_ev)",
"{"],
stack=msgfuncs)
self.push(" /* Implement all forms of reduction as a reduce-to-one followed by an optional multicast. */", msgfuncs)
self.code_declare_var(name="sendrank",
rhs="reduce_ev->sendrank",
comment="This task's rank in the reduction step",
stack=msgfuncs)
self.code_declare_var(name="recvrank",
rhs="reduce_ev->recvrank",
comment="This task's rank in the multicast step",
stack=msgfuncs)
self.code_declare_var(name="msgsize",
rhs="reduce_ev->numitems * reduce_ev->itemsize",
comment="The number of bytes in the reduction message",
stack=msgfuncs)
self.code_declare_var(type="ncptl_int *", name="send_peerlist",
rhs="(ncptl_int *) ncptl_queue_contents(reduce_ev->all_senders, 0)",
comment="List of our reduction peers' physical task numbers",
stack=msgfuncs)
self.code_declare_var(type="ncptl_int *", name="recv_peerlist",
rhs="(ncptl_int *) ncptl_queue_contents(reduce_ev->all_receivers, 0)",
comment="List of our multicast peers' physical task numbers",
stack=msgfuncs)
self.code_declare_var(name="num_send_peers",
rhs="ncptl_queue_length(reduce_ev->all_senders)",
comment="Number of tasks involved in the reduction step",
stack=msgfuncs)
self.code_declare_var(name="num_recv_peers",
rhs="ncptl_queue_length(reduce_ev->all_receivers)",
comment="Number of tasks involved in the multicast step",
stack=msgfuncs)
self.code_declare_var(type="CONC_SEND_EVENT", name="sendev",
comment="Send event to pass to conc_asend_msg()",
stack=msgfuncs)
self.code_declare_var(type="CONC_RECV_EVENT", name="recvev",
comment="Receive event to pass to conc_recv_msg()",
stack=msgfuncs)
self.pushmany([
"",
" /* Implement a reduction tree to reduce a value to the first sender. */",
"memset ((void *)&sendev, 0, sizeof(CONC_SEND_EVENT));",
"sendev.size = msgsize;"],
stack=msgfuncs)
for field in ["alignment", "buffernum", "bufferofs", "misaligned",
"touching", "buffer"]:
self.push("sendev.%s = reduce_ev->%s;" % (field, field), msgfuncs)
self.pushmany([
"memset ((void *)&recvev, 0, sizeof(CONC_RECV_EVENT));",
"recvev.size = msgsize;"],
stack=msgfuncs)
for field in ["alignment", "buffernum", "bufferofs", "misaligned",
"touching", "buffer"]:
self.push("recvev.%s = reduce_ev->%s;" % (field, field), msgfuncs)
self.pushmany([
"if (reduce_ev->sending) {",
" /* Receive asynchronously from our children. */",
"if ((sendrank+1)*2-1 < num_send_peers) {",
"recvev.source = send_peerlist[(sendrank+1)*2-1];",
"conc_arecv_msg (cstate, &recvev);",
"if ((sendrank+1)*2 < num_send_peers) {",
"recvev.source = send_peerlist[(sendrank+1)*2];",
"conc_arecv_msg (cstate, &recvev);",
"}",
"conc_wait_all (cstate);",
"}",
"",
" /* Send synchronously to our parent. */",
"if (sendrank > 0) {",
"sendev.dest = send_peerlist[(sendrank-1)/2];",
"conc_send_msg (cstate, &sendev);",
"}",
"else {",
" /* The root of the reduction sends to the root of the multicast. */",
"if (send_peerlist[0] != recv_peerlist[0]) {",
"sendev.dest = recv_peerlist[0];",
"conc_send_msg (cstate, &sendev);",
"}"
"}"
"}"],
stack=msgfuncs)
self.pushmany([
"",
" /* Implement a multicast tree to multicast from the first receiver. */",
"if (reduce_ev->receiving) {",
"if (recvrank == 0 && send_peerlist[0] != recv_peerlist[0]) {",
" /* The root of the multicast receives from the root of the reduction. */",
"recvev.source = send_peerlist[0];",
"conc_recv_msg (cstate, &recvev);",
"}",
"",
"if (recvrank > 0) {",
" /* Receive synchronously from our parent. */",
"recvev.source = recv_peerlist[(recvrank-1)/2];",
"conc_recv_msg (cstate, &recvev);",
"}",
"if ((recvrank+1)*2-1 < num_recv_peers) {",
" /* Send asynchronously to our left child. */",
"sendev.dest = recv_peerlist[(recvrank+1)*2 - 1];",
"conc_asend_msg (cstate, &sendev);",
"if ((recvrank+1)*2 < num_recv_peers) {",
" /* Send asynchronously to our right child. */",
"sendev.dest = recv_peerlist[(recvrank+1)*2];",
"conc_asend_msg (cstate, &sendev);",
"}",
"",
" /* Wait for any blocked sends to complete. */",
"conc_wait_all (cstate);",
"}",
"}",
"}"],
stack=msgfuncs)
# Return the list of function definitions.
return msgfuncs
# -------------- #
# Initialization #
# -------------- #
def code_define_functions_INIT_COMM_1(self, localvars):
"Define extra initialization to be performed after ncptl_init()."
return [
" /* Prevent exiting children from killing their parent. */",
"ncptl_permit_signal(SIGCHLD);"]
def code_def_init_cmd_line_PRE_PARSE(self, localvars):
"Toggle the abnormal_exit flag."
return ['abnormal_exit = 0; /* Let "--help" exit normally. */']
def code_def_init_cmd_line_POST_PARSE(self, localvars):
"Toggle the abnormal_exit flag."
return ['abnormal_exit = 1;']
def code_define_functions_INIT_COMM_3(self, localvars):
"Generate code to initialize the c_udgram backend."
initcode = []
# Create a unique name for every socket we plan to use.
self.pushmany([
" /* Create names for all of the sockets every task will need. */",
"socketinfo = (struct sockaddr_un ***) ncptl_malloc (NUMCHANNELSETS*sizeof (struct sockaddr_un **), 0);",
"for (cset=0; cset<NUMCHANNELSETS; cset++) {"],
stack=initcode)
self.code_declare_var(name="src", comment="Source task ID",
stack=initcode)
self.code_declare_var(name="dest", comment="Destination task ID",
stack=initcode)
self.pushmany([
"socketinfo[cset] = (struct sockaddr_un **) ncptl_malloc (var_num_tasks*sizeof (struct sockaddr_un *), 0);",
"for (dest = 0; dest < var_num_tasks; dest++) {",
"socketinfo[cset][dest] = (struct sockaddr_un *) ncptl_malloc (var_num_tasks*sizeof (struct sockaddr_un), 0);",
"for (src = 0; src < var_num_tasks; src++) {"],
stack=initcode)
self.code_declare_var(type="int", name="tempfd",
comment="File descriptor returned by mkstemp() (not used)",
stack=initcode)
self.pushmany([
"socketinfo[cset][dest][src].sun_family = AF_UNIX;",
"strcpy (socketinfo[cset][dest][src].sun_path, SOCKET_TEMPLATE);",
"if ((tempfd=mkstemp(socketinfo[cset][dest][src].sun_path)) == -1)",
'CONC_SYSTEM_ERROR ("Failed to create a unique filename");',
"if (close (tempfd) == -1)",
'CONC_SYSTEM_ERROR ("Failed to close an open file");',
"}",
"}",
"}",
""],
stack=initcode)
# Spawn child tasks.
self.pushmany([
" /* Spawn var_num_tasks-1 processes (one per task excluding the master). */",
"physrank = 0;",
"if (setpgid (0, 0) == -1)",
'CONC_SYSTEM_ERROR ("Failed to start a new process group");',
"for (i=1; i<var_num_tasks; i++) {",
" /* Spawn a child task and assign it a virtual task ID. While",
" * this could be done in a tree pattern instead of linearly,",
" * we expect var_num_tasks to be small; plus, a simple mapping",
" * from PIDs to tasks may help debug deadlocks and other",
" * problems. */"],
stack=initcode)
self.code_declare_var(type="int", name="newpid",
comment="0=child; other=parent",
stack=initcode)
self.pushmany([
"if ((newpid=fork()) == -1)",
'CONC_SYSTEM_ERROR ("Failed to spawn a child process");',
"else",
"if (!newpid) {",
" /* Child */",
"physrank = (ncptl_int) i;",
"break;",
"}",
"}",
""],
stack=initcode)
# Create and bind socket connections to every other task.
self.pushmany([
" /* Create and bind sockets for inter-task communication. */",
"for (cset=0; cset<NUMCHANNELSETS; cset++) {"],
stack=initcode)
self.code_declare_var(type="COMMSTATE *", name="cstate",
rhs="&commstate[cset]", comment="Current channel set",
stack=initcode)
self.pushmany([
"cstate->channels = (int *) ncptl_malloc (var_num_tasks*sizeof (int), 0);",
"for (taskID=0; taskID<var_num_tasks; taskID++) {",
"if ((cstate->channels[taskID] = socket (PF_UNIX, SOCK_DGRAM, 0)) == -1)",
'CONC_SYSTEM_ERROR ("Socket creation failed");',
"if (unlink (socketinfo[cset][physrank][taskID].sun_path) == -1)",
'CONC_SYSTEM_ERROR ("File deletion failed");',
"if (bind (cstate->channels[taskID],",
"(const struct sockaddr *) &socketinfo[cset][physrank][taskID],",
"SUN_LEN (&socketinfo[cset][physrank][taskID])) == -1)",
'CONC_SYSTEM_ERROR ("Failed to bind a socket");',
"}",
"}",
""],
stack=initcode)
# Connect all of the sockets we created.
self.pushmany([
" /* Connect to each of our peers in turn. */",
"for (cset=0; cset<NUMCHANNELSETS; cset++) {"],
stack=initcode)
self.code_declare_var(type="COMMSTATE *", name="cstate",
rhs="&commstate[cset]", comment="Current channel set",
stack=initcode)
self.pushmany([
"for (taskID=0; taskID<var_num_tasks; taskID++) {",
" /* Keep trying to connect until the socket we want",
" * to connect to exists and is, in fact, a socket. */",
"while (connect (cstate->channels[taskID],",
"(const struct sockaddr *) &socketinfo[cset][taskID][physrank],",
"SUN_LEN (&socketinfo[cset][taskID][physrank])) == -1) {",
"if (errno!=ECONNREFUSED && errno!=ENOENT)",
'CONC_SYSTEM_ERROR ("Failed to connect a socket");',
"usleep (1000);",
"}",
"",
" /* Now that we're connected, put the socket in nonblocking mode. */",
"CONC_SET_BLOCKING (cstate, taskID, 0);",