1 /**************************************************************************
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
5 * Copyright 2010-2011 LunarG, Inc.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
28 **************************************************************************/
35 #include "c11/threads.h"
37 #include "eglglobals.h"
38 #include "egldevice.h"
39 #include "egldisplay.h"
40 #include "egldriver.h"
42 #include "util/macros.h"
50 static mtx_t _eglGlobalMutex
= _MTX_INITIALIZER_NP
;
52 struct _egl_global _eglGlobal
=
54 .Mutex
= &_eglGlobalMutex
,
56 .DeviceList
= &_eglSoftwareDevice
,
59 /* default AtExitCalls, called in reverse order */
60 _eglFiniDevice
, /* always called last */
65 .ClientOnlyExtensionString
=
66 "EGL_EXT_client_extensions"
67 " EGL_EXT_device_base"
68 " EGL_EXT_device_enumeration"
69 " EGL_EXT_device_query"
70 " EGL_EXT_platform_base"
71 " EGL_KHR_client_get_all_proc_addresses"
74 .PlatformExtensionString
=
75 #ifdef HAVE_WAYLAND_PLATFORM
76 " EGL_EXT_platform_wayland"
78 #ifdef HAVE_X11_PLATFORM
79 " EGL_EXT_platform_x11"
81 #ifdef HAVE_DRM_PLATFORM
82 " EGL_MESA_platform_gbm"
84 #ifdef HAVE_SURFACELESS_PLATFORM
85 " EGL_MESA_platform_surfaceless"
87 " EGL_EXT_platform_device"
90 .ClientExtensionString
= NULL
,
92 .debugCallback
= NULL
,
93 .debugTypesEnabled
= _EGL_DEBUG_BIT_CRITICAL
| _EGL_DEBUG_BIT_ERROR
,
101 for (i
= _eglGlobal
.NumAtExitCalls
- 1; i
>= 0; i
--)
102 _eglGlobal
.AtExitCalls
[i
]();
107 _eglAddAtExitCall(void (*func
)(void))
110 static EGLBoolean registered
= EGL_FALSE
;
112 mtx_lock(_eglGlobal
.Mutex
);
116 registered
= EGL_TRUE
;
119 assert(_eglGlobal
.NumAtExitCalls
< ARRAY_SIZE(_eglGlobal
.AtExitCalls
));
120 _eglGlobal
.AtExitCalls
[_eglGlobal
.NumAtExitCalls
++] = func
;
122 mtx_unlock(_eglGlobal
.Mutex
);
127 _eglGetClientExtensionString(void)
131 mtx_lock(_eglGlobal
.Mutex
);
133 if (_eglGlobal
.ClientExtensionString
== NULL
) {
134 size_t clientLen
= strlen(_eglGlobal
.ClientOnlyExtensionString
);
135 size_t platformLen
= strlen(_eglGlobal
.PlatformExtensionString
);
137 _eglGlobal
.ClientExtensionString
= (char *) malloc(clientLen
+ platformLen
+ 1);
138 if (_eglGlobal
.ClientExtensionString
!= NULL
) {
139 char *ptr
= _eglGlobal
.ClientExtensionString
;
141 memcpy(ptr
, _eglGlobal
.ClientOnlyExtensionString
, clientLen
);
144 if (platformLen
> 0) {
145 // Note that if PlatformExtensionString is not empty, then it will
146 // already have a leading space.
147 assert(_eglGlobal
.PlatformExtensionString
[0] == ' ');
148 memcpy(ptr
, _eglGlobal
.PlatformExtensionString
, platformLen
);
154 ret
= _eglGlobal
.ClientExtensionString
;
156 mtx_unlock(_eglGlobal
.Mutex
);
161 _eglPointerIsDereferencable(void *p
)
163 uintptr_t addr
= (uintptr_t) p
;
164 const long page_size
= getpagesize();
166 unsigned char valid
= 0;
171 /* align addr to page_size */
172 addr
&= ~(page_size
- 1);
174 if (mincore((void *) addr
, page_size
, &valid
) < 0) {
178 /* mincore() returns 0 on success, and -1 on failure. The last parameter
179 * is a vector of bytes with one entry for each page queried. mincore
180 * returns page residency information in the first bit of each byte in the
183 * Residency doesn't actually matter when determining whether a pointer is
184 * dereferenceable, so the output vector can be ignored. What matters is
185 * whether mincore succeeds. See:
187 * http://man7.org/linux/man-pages/man2/mincore.2.html
191 // Without mincore(), we just assume that the first page is unmapped.
192 return addr
>= page_size
;