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gimp/app/plug-in/gimppluginshm.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimppluginhsm.c
*
* This program 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.
*
* This program 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 "config.h"
#include <sys/types.h>
#include <errno.h>
#if defined(USE_SYSV_SHM)
#ifdef HAVE_IPC_H
#include <sys/ipc.h>
#endif
#ifdef HAVE_SHM_H
#include <sys/shm.h>
#endif
#elif defined(USE_POSIX_SHM)
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <sys/mman.h>
#endif /* USE_POSIX_SHM */
#include <gio/gio.h>
#include <gegl.h>
#if defined(G_OS_WIN32) || defined(G_WITH_CYGWIN)
#define STRICT
#include <windows.h>
#include <process.h>
#ifdef G_OS_WIN32
#include <fcntl.h>
#include <io.h>
#endif
#define USE_WIN32_SHM 1
#endif /* G_OS_WIN32 || G_WITH_CYGWIN */
#include "plug-in-types.h"
#include "core/gimp-utils.h"
#include "gimppluginshm.h"
#include "gimp-log.h"
#define TILE_MAP_SIZE (GIMP_PLUG_IN_TILE_WIDTH * GIMP_PLUG_IN_TILE_HEIGHT * 32)
#define ERRMSG_SHM_DISABLE "Disabling shared memory tile transport"
struct _GimpPlugInShm
{
gint shm_ID;
guchar *shm_addr;
#if defined(USE_WIN32_SHM)
HANDLE shm_handle;
#endif
};
GimpPlugInShm *
gimp_plug_in_shm_new (void)
{
/* allocate a piece of shared memory for use in transporting tiles
* to plug-ins. if we can't allocate a piece of shared memory then
* we'll fall back on sending the data over the pipe.
*/
GimpPlugInShm *shm = g_slice_new0 (GimpPlugInShm);
shm->shm_ID = -1;
#if defined(USE_SYSV_SHM)
/* Use SysV shared memory mechanisms for transferring tile data. */
{
shm->shm_ID = shmget (IPC_PRIVATE, TILE_MAP_SIZE, IPC_CREAT | 0600);
if (shm->shm_ID != -1)
{
shm->shm_addr = (guchar *) shmat (shm->shm_ID, NULL, 0);
if (shm->shm_addr == (guchar *) -1)
{
g_printerr ("shmat() failed: %s\n" ERRMSG_SHM_DISABLE,
g_strerror (errno));
shmctl (shm->shm_ID, IPC_RMID, NULL);
shm->shm_ID = -1;
}
#ifdef IPC_RMID_DEFERRED_RELEASE
if (shm->shm_addr != (guchar *) -1)
shmctl (shm->shm_ID, IPC_RMID, NULL);
#endif
}
else
{
g_printerr ("shmget() failed: %s\n" ERRMSG_SHM_DISABLE,
g_strerror (errno));
}
}
#elif defined(USE_WIN32_SHM)
/* Use Win32 shared memory mechanisms for transferring tile data. */
{
gint pid;
gchar fileMapName[MAX_PATH];
/* Our shared memory id will be our process ID */
pid = GetCurrentProcessId ();
/* From the id, derive the file map name */
g_snprintf (fileMapName, sizeof (fileMapName), "GIMP%d.SHM", pid);
/* Create the file mapping into paging space */
shm->shm_handle = CreateFileMapping (INVALID_HANDLE_VALUE, NULL,
PAGE_READWRITE, 0,
TILE_MAP_SIZE,
fileMapName);
if (shm->shm_handle)
{
/* Map the shared memory into our address space for use */
shm->shm_addr = (guchar *) MapViewOfFile (shm->shm_handle,
FILE_MAP_ALL_ACCESS,
0, 0, TILE_MAP_SIZE);
/* Verify that we mapped our view */
if (shm->shm_addr)
{
shm->shm_ID = pid;
}
else
{
g_printerr ("MapViewOfFile error: %d... " ERRMSG_SHM_DISABLE,
GetLastError ());
}
}
else
{
g_printerr ("CreateFileMapping error: %d... " ERRMSG_SHM_DISABLE,
GetLastError ());
}
}
#elif defined(USE_POSIX_SHM)
/* Use POSIX shared memory mechanisms for transferring tile data. */
{
gint pid;
gchar shm_handle[32];
gint shm_fd;
/* Our shared memory id will be our process ID */
pid = gimp_get_pid ();
/* From the id, derive the file map name */
g_snprintf (shm_handle, sizeof (shm_handle), "/gimp-shm-%d", pid);
/* Create the file mapping into paging space */
shm_fd = shm_open (shm_handle, O_RDWR | O_CREAT, 0600);
if (shm_fd != -1)
{
if (ftruncate (shm_fd, TILE_MAP_SIZE) != -1)
{
/* Map the shared memory into our address space for use */
shm->shm_addr = (guchar *) mmap (NULL, TILE_MAP_SIZE,
PROT_READ | PROT_WRITE, MAP_SHARED,
shm_fd, 0);
/* Verify that we mapped our view */
if (shm->shm_addr != MAP_FAILED)
{
shm->shm_ID = pid;
}
else
{
g_printerr ("mmap() failed: %s\n" ERRMSG_SHM_DISABLE,
g_strerror (errno));
shm_unlink (shm_handle);
}
}
else
{
g_printerr ("ftruncate() failed: %s\n" ERRMSG_SHM_DISABLE,
g_strerror (errno));
shm_unlink (shm_handle);
}
close (shm_fd);
}
else
{
g_printerr ("shm_open() failed: %s\n" ERRMSG_SHM_DISABLE,
g_strerror (errno));
}
}
#endif
if (shm->shm_ID == -1)
{
g_slice_free (GimpPlugInShm, shm);
shm = NULL;
}
else
{
GIMP_LOG (SHM, "attached shared memory segment ID = %d", shm->shm_ID);
}
return shm;
}
void
gimp_plug_in_shm_free (GimpPlugInShm *shm)
{
g_return_if_fail (shm != NULL);
if (shm->shm_ID != -1)
{
#if defined (USE_SYSV_SHM)
shmdt (shm->shm_addr);
#ifndef IPC_RMID_DEFERRED_RELEASE
shmctl (shm->shm_ID, IPC_RMID, NULL);
#endif
#elif defined(USE_WIN32_SHM)
if (shm->shm_handle)
CloseHandle (shm->shm_handle);
#elif defined(USE_POSIX_SHM)
gchar shm_handle[32];
munmap (shm->shm_addr, TILE_MAP_SIZE);
g_snprintf (shm_handle, sizeof (shm_handle), "/gimp-shm-%d",
shm->shm_ID);
shm_unlink (shm_handle);
#endif
GIMP_LOG (SHM, "detached shared memory segment ID = %d", shm->shm_ID);
}
g_slice_free (GimpPlugInShm, shm);
}
gint
gimp_plug_in_shm_get_ID (GimpPlugInShm *shm)
{
g_return_val_if_fail (shm != NULL, -1);
return shm->shm_ID;
}
guchar *
gimp_plug_in_shm_get_addr (GimpPlugInShm *shm)
{
g_return_val_if_fail (shm != NULL, NULL);
return shm->shm_addr;
}
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