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101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
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/*
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* Copyright 1994 Christopher Seiwald.
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*
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* This file is part of Jam - see jam.c for Copyright information.
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*/
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/*
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* command.h - the CMD structure and routines to manipulate them
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*
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* Both ACTION and CMD contain a rule, targets, and sources. An
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* ACTION describes a rule to be applied to the given targets and
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* sources; a CMD is what actually gets executed by the shell. The
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* differences are due to:
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*
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* ACTIONS must be combined if 'actions together' is given.
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* ACTIONS must be split if 'actions piecemeal' is given.
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* ACTIONS must have current sources omitted for 'actions updated'.
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*
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* The CMD datatype holds a single command that is to be executed
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* against a target, and they can chain together to represent the
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* full collection of commands used to update a target.
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*
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* Structures:
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*
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* CMD - an action, ready to be formatted into a buffer and executed.
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*
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* External routines:
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*
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* cmd_new() - return a new CMD or 0 if too many args.
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* cmd_free() - delete CMD and its parts.
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* cmd_next() - walk the CMD chain.
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* cmd_release_targets_and_shell() - CMD forgets about its targets & shell.
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*/
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/*
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* CMD - an action, ready to be formatted into a buffer and executed.
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*/
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#ifndef COMMAND_SW20111118_H
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#define COMMAND_SW20111118_H
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#include "lists.h"
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#include "rules.h"
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#include "strings.h"
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typedef struct _cmd CMD;
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/*
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* A list whose elements are either TARGETS or CMDS.
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* CMDLIST is used only by CMD. A TARGET means that
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* the CMD is the last updating action required to
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* build the target. A CMD is the next CMD required
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* to build the same target. (Note that a single action
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* can update more than one target, so the CMDs form
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* a DAG, not a straight linear list.)
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*/
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typedef struct _cmdlist {
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struct _cmdlist * next;
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union {
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CMD * cmd;
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TARGET * t;
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} impl;
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char iscmd;
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} CMDLIST;
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CMDLIST * cmdlist_append_cmd( CMDLIST *, CMD * );
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CMDLIST * cmdlist_append_target( CMDLIST *, TARGET * );
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void cmd_list_free( CMDLIST * );
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struct _cmd
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{
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CMDLIST * next;
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RULE * rule; /* rule->actions contains shell script */
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LIST * shell; /* $(JAMSHELL) value */
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LOL args; /* LISTs for $(<), $(>) */
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string buf[ 1 ]; /* actual commands */
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int noop; /* no-op commands should be faked instead of executed */
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int asynccnt; /* number of outstanding dependencies */
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TARGETS * lock; /* semaphores that are required by this cmd. */
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TARGETS * unlock; /* semaphores that are released when this cmd finishes. */
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char status; /* the command status */
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};
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CMD * cmd_new
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(
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RULE * rule, /* rule (referenced) */
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LIST * targets, /* $(<) (ownership transferred) */
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LIST * sources, /* $(>) (ownership transferred) */
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LIST * shell /* $(JAMSHELL) (ownership transferred) */
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);
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void cmd_release_targets_and_shell( CMD * );
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void cmd_free( CMD * );
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#define cmd_next( c ) ((c)->next)
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#endif
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