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annotate src/thread/irix/SDL_syssem.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents ad887c988713
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_thread.h"
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25 #include "SDL_timer.h"
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26
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <sys/types.h>
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31 #include <sys/ipc.h>
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32 #include <sys/sem.h>
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33 #include <errno.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_thread.h"
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37
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38
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39 struct SDL_semaphore
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40 {
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41 int id;
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42 };
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43
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44 /* Not defined by many operating systems, use configure to detect */
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45 /*
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46 #if !defined(HAVE_SEMUN)
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47 union semun {
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48 int val;
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49 struct semid_ds *buf;
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50 ushort *array;
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51 };
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52 #endif
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53 */
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54
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55 static struct sembuf op_trywait[2] = {
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56 {0, -1, (IPC_NOWAIT | SEM_UNDO)} /* Decrement semaphore, no block */
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57 };
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58 static struct sembuf op_wait[2] = {
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59 {0, -1, SEM_UNDO} /* Decrement semaphore */
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60 };
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61 static struct sembuf op_post[1] = {
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62 {0, 1, (IPC_NOWAIT | SEM_UNDO)} /* Increment semaphore */
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63 };
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64
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65 /* Create a blockable semaphore */
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66 SDL_sem *
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67 SDL_CreateSemaphore (Uint32 initial_value)
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68 {
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69 extern int _creating_thread_lock; /* SDL_threads.c */
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70 SDL_sem *sem;
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71 union semun init;
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72
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73 sem = (SDL_sem *) SDL_malloc (sizeof (*sem));
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74 if (sem == NULL) {
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75 SDL_OutOfMemory ();
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76 return (NULL);
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77 }
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78 sem->id = semget (IPC_PRIVATE, 1, (0600 | IPC_CREAT));
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79 if (sem->id < 0) {
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80 SDL_SetError ("Couldn't create semaphore");
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81 SDL_free (sem);
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82 return (NULL);
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83 }
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84 init.val = initial_value; /* Initialize semaphore */
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85 semctl (sem->id, 0, SETVAL, init);
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86 return (sem);
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87 }
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88
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89 void
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90 SDL_DestroySemaphore (SDL_sem * sem)
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91 {
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92 if (sem) {
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93 #ifdef __IRIX__
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94 semctl (sem->id, 0, IPC_RMID);
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95 #else
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96 union semun dummy;
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97 dummy.val = 0;
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98 semctl (sem->id, 0, IPC_RMID, dummy);
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99 #endif
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100 SDL_free (sem);
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101 }
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102 }
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103
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104 int
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105 SDL_SemTryWait (SDL_sem * sem)
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106 {
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107 int retval;
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108
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109 if (!sem) {
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110 SDL_SetError ("Passed a NULL semaphore");
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111 return -1;
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112 }
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113
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114 retval = 0;
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115 tryagain:
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116 if (semop (sem->id, op_trywait, 1) < 0) {
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117 if (errno == EINTR) {
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118 goto tryagain;
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119 }
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120 retval = SDL_MUTEX_TIMEDOUT;
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121 }
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122 return retval;
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123 }
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124
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125 int
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Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
126 SDL_SemWait (SDL_sem * sem)
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
127 {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
128 int retval;
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19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
129
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
130 if (!sem) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
131 SDL_SetError ("Passed a NULL semaphore");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
132 return -1;
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Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
133 }
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19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
134
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
135 retval = 0;
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19418e4422cb New configure-based build system. Still work in progress, but much improved
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diff changeset
136 tryagain:
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1499
diff changeset
137 if (semop (sem->id, op_wait, 1) < 0) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1499
diff changeset
138 if (errno == EINTR) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
139 goto tryagain;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
140 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
141 SDL_SetError ("Semaphore operation error");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
142 retval = -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
143 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
144 return retval;
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
145 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
146
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
147 int
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
148 SDL_SemWaitTimeout (SDL_sem * sem, Uint32 timeout)
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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parents:
diff changeset
149 {
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
150 int retval;
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19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
151
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
152 if (!sem) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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153 SDL_SetError ("Passed a NULL semaphore");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
154 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
155 }
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19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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157 /* Try the easy cases first */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
158 if (timeout == 0) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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159 return SDL_SemTryWait (sem);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
160 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
161 if (timeout == SDL_MUTEX_MAXWAIT) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
162 return SDL_SemWait (sem);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
163 }
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
164
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
165 /* Ack! We have to busy wait... */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
166 timeout += SDL_GetTicks ();
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
167 do {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
168 retval = SDL_SemTryWait (sem);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
169 if (retval == 0) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
170 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
171 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
172 SDL_Delay (1);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
173 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
174 while (SDL_GetTicks () < timeout);
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
176 return retval;
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
177 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
178
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
179 Uint32
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
180 SDL_SemValue (SDL_sem * sem)
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
181 {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
182 int semval;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
183 Uint32 value;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
184
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
185 value = 0;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
186 if (sem) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
187 tryagain:
1402
d910939febfa Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents: 1361
diff changeset
188 #ifdef __IRIX__
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
189 semval = semctl (sem->id, 0, GETVAL);
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190 #else
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
191 {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
192 union semun arg;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
193 arg.val = 0;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
194 semval = semctl (sem->id, 0, GETVAL, arg);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
195 }
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196 #endif
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
197 if (semval < 0) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
198 if (errno == EINTR) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
199 goto tryagain;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
200 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
201 } else {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
202 value = (Uint32) semval;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
203 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
204 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
205 return value;
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 }
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
208 int
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
209 SDL_SemPost (SDL_sem * sem)
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
211 int retval;
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
213 if (!sem) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
214 SDL_SetError ("Passed a NULL semaphore");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
215 return -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
216 }
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
218 retval = 0;
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 tryagain:
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
220 if (semop (sem->id, op_post, 1) < 0) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
221 if (errno == EINTR) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
222 goto tryagain;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
223 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
224 SDL_SetError ("Semaphore operation error");
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
225 retval = -1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
226 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
227 return retval;
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228 }
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
229
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1499
diff changeset
230 /* vi: set ts=4 sw=4 expandtab: */