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/* Windows32-based operating system interface for GNU Make.
Copyright (C) 2016 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make 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 3 of the License, or (at your option) any later
version.
GNU Make 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
this program. If not, see <http://www.gnu.org/licenses/>. */
#include "makeint.h"
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <process.h>
#include <io.h>
#include "pathstuff.h"
#ifndef CONFIG_NEW_WIN_CHILDREN
# include "sub_proc.h"
#else
# include "winchildren.h"
#endif
#include "w32err.h"
#include "os.h"
#include "debug.h"
/* This section provides OS-specific functions to support the jobserver. */
static char jobserver_semaphore_name[MAX_PATH + 1];
static HANDLE jobserver_semaphore = NULL;
unsigned int
jobserver_setup (int slots)
{
#ifndef CONFIG_NEW_WIN_CHILDREN
/* sub_proc.c cannot wait for more than MAXIMUM_WAIT_OBJECTS objects
* and one of them is the job-server semaphore object. Limit the
* number of available job slots to (MAXIMUM_WAIT_OBJECTS - 1). */
if (slots >= MAXIMUM_WAIT_OBJECTS)
{
slots = MAXIMUM_WAIT_OBJECTS - 1;
DB (DB_JOBS, (_("Jobserver slots limited to %d\n"), slots));
}
#endif
sprintf (jobserver_semaphore_name, "gmake_semaphore_%d", _getpid ());
jobserver_semaphore = CreateSemaphore (
NULL, /* Use default security descriptor */
slots, /* Initial count */
slots, /* Maximum count */
jobserver_semaphore_name); /* Semaphore name */
if (jobserver_semaphore == NULL)
{
DWORD err = GetLastError ();
const char *estr = map_windows32_error_to_string (err);
ONS (fatal, NILF,
_("creating jobserver semaphore: (Error %ld: %s)"), err, estr);
}
return 1;
}
unsigned int
jobserver_parse_auth (const char *auth)
{
jobserver_semaphore = OpenSemaphore (
SEMAPHORE_ALL_ACCESS, /* Semaphore access setting */
FALSE, /* Child processes DON'T inherit */
auth); /* Semaphore name */
if (jobserver_semaphore == NULL)
{
DWORD err = GetLastError ();
const char *estr = map_windows32_error_to_string (err);
fatal (NILF, strlen (auth) + INTSTR_LENGTH + strlen (estr),
_("internal error: unable to open jobserver semaphore '%s': (Error %ld: %s)"),
auth, err, estr);
}
DB (DB_JOBS, (_("Jobserver client (semaphore %s)\n"), auth));
return 1;
}
char *
jobserver_get_auth ()
{
return xstrdup (jobserver_semaphore_name);
}
unsigned int
jobserver_enabled ()
{
return jobserver_semaphore != NULL;
}
/* Close jobserver semaphore */
void
jobserver_clear ()
{
if (jobserver_semaphore != NULL)
{
CloseHandle (jobserver_semaphore);
jobserver_semaphore = NULL;
}
}
void
jobserver_release (int is_fatal)
{
if (! ReleaseSemaphore (
jobserver_semaphore, /* handle to semaphore */
1, /* increase count by one */
NULL)) /* not interested in previous count */
{
if (is_fatal)
{
DWORD err = GetLastError ();
const char *estr = map_windows32_error_to_string (err);
ONS (fatal, NILF,
_("release jobserver semaphore: (Error %ld: %s)"), err, estr);
}
perror_with_name ("release_jobserver_semaphore", "");
}
}
unsigned int
jobserver_acquire_all ()
{
unsigned int tokens = 0;
while (1)
{
DWORD dwEvent = WaitForSingleObject (
jobserver_semaphore, /* Handle to semaphore */
0); /* DON'T wait on semaphore */
if (dwEvent != WAIT_OBJECT_0)
return tokens;
++tokens;
}
}
void
jobserver_signal ()
{
}
void jobserver_pre_child (int recursive)
{
}
void jobserver_post_child (int recursive)
{
}
void
jobserver_pre_acquire ()
{
}
/* Returns 1 if we got a token, or 0 if a child has completed.
The Windows implementation doesn't support load detection. */
unsigned int
jobserver_acquire (int timeout)
{
#ifndef CONFIG_NEW_WIN_CHILDREN
HANDLE handles[MAXIMUM_WAIT_OBJECTS + 1]; /* bird: + 1 to prevent trashing the stack. */
#else
HANDLE handles[2];
#endif
DWORD dwHandleCount;
DWORD dwEvent;
/* Add jobserver semaphore to first slot. */
handles[0] = jobserver_semaphore;
#ifndef CONFIG_NEW_WIN_CHILDREN
/* Build array of handles to wait for. */
dwHandleCount = 1 + process_set_handles (&handles[1]);
dwEvent = WaitForMultipleObjects (
dwHandleCount, /* number of objects in array */
handles, /* array of objects */
FALSE, /* wait for any object */
INFINITE); /* wait until object is signalled */
#else
/* Add the completed children event as the 2nd one. */
handles[1] = (HANDLE)MkWinChildGetCompleteEventHandle ();
if (handles[1] == NULL)
return 0;
dwHandleCount = 2;
dwEvent = WaitForMultipleObjectsEx (dwHandleCount,
handles,
FALSE /*bWaitAll*/,
256, /* INFINITE - paranoia, only wait 256 ms before checking again. */
TRUE /*bAlertable*/);
#endif
if (dwEvent == WAIT_FAILED)
{
DWORD err = GetLastError ();
const char *estr = map_windows32_error_to_string (err);
ONS (fatal, NILF,
_("semaphore or child process wait: (Error %ld: %s)"),
err, estr);
}
/* WAIT_OBJECT_0 indicates that the semaphore was signalled. */
return dwEvent == WAIT_OBJECT_0;
}
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