src/atomic/SDL_spinlock.c


Log

Author Commit Date CI Message
Sam Lantinga 120c76c8 2022-01-03T09:40:00 Updated copyright for 2022
Ozkan Sezer 53aa8eec 2021-11-25T17:00:24 minor cleanup for watcom _inline keyword.
Ryan C. Gordon f4eb7f32 2021-07-27T13:45:33 spinlock: Favor gcc-style atomics over MSVC interfaces. This resolves a problem when using Clang on Windows. Fixes #4346.
Cameron Gutman 014f507c 2021-01-03T12:13:40 Use specific acquire and release variants of InterlockedExchange on ARM _InterlockedExchange_rel() is required for correctness on ARM because the _ReadWriteBarrier() macro is only a compiler memory barrier, not a hardware memory barrier. Due to ARM's relaxed memory model, this means the '*lock = 0' write may be observed before the operations inside the lock, causing possible corruption of data protected by the lock. _InterlockedExchange_acq() is more efficient on ARM because it avoids an expensive full memory barrier that _InterlockedExchange() does.
Cameron Gutman 59594a78 2021-01-02T13:43:04 Implement PAUSE_INSTRUCTION() for Windows ARM platforms
Sam Lantinga 9130f7c3 2021-01-02T10:25:38 Updated copyright for 2021
Sam Lantinga d25eff65 2021-01-02T10:06:22 Fixed bug 5429 - spinlock implements PAUSE_INSTRUCTION for PPC platforms David Carlier This form of 'or' provides a hint that performance will probably be improved if shared resources dedicated to the executing processor are released for use by other processors
Sam Lantinga 6bd4c717 2020-12-17T21:41:23 Fixed bug 5402 - ARM support little update proposal David Carlier No fix but mostly an update for ARM architecture.
Cameron Cawley 8f1a916a 2020-02-13T20:50:47 Add basic support for compiling on RISC OS
Sam Lantinga a8780c6a 2020-01-16T20:49:25 Updated copyright date for 2020
Cameron Cawley 85aabec2 2019-10-11T22:08:53 atomic: Support compiling on ARMv3
Sam Lantinga 5e13087b 2019-01-04T22:01:14 Updated copyright for 2019
Ozkan Sezer d9fb77a3 2018-09-27T11:55:02 SDL_atomic.c, SDL_spinlock.c: use lock prefix with xchg in Watcom asm.
Ozkan Sezer 949b8bd8 2018-06-30T20:10:40 correct the comment correction..
Ozkan Sezer 67f18a19 2018-06-30T20:04:01 comment correction
Ryan C. Gordon 52857de2 2018-06-29T16:55:55 Corrected a comment.
Ryan C. Gordon 3b173f81 2018-06-25T23:00:38 Patched to compile on Visual Studio (typo).
Ryan C. Gordon 58168a8c 2018-06-25T16:34:16 atomic: Fight with all the assemblers that don't like REP NOP. :/
Ryan C. Gordon 5f123e31 2018-06-25T15:58:35 atomic: Spin locks now try to use the x86 PAUSE instruction for short waits. Fixes Bugzilla #4151.
Sam Lantinga e3cc5b2c 2018-01-03T10:03:25 Updated copyright for 2018
Ozkan Sezer 500378eb 2017-08-18T16:35:55 Add atomics for Watcom/x86 as inline asm Partially fixes Bugzilla #3758.
Sam Lantinga 45b774e3 2017-01-01T18:33:28 Updated copyright for 2017
Sam Lantinga 42065e78 2016-01-02T10:10:34 Updated copyright to 2016
Philipp Wiesemann 0e45984f 2015-06-21T17:33:46 Fixed crash if initialization of EGL failed but was tried again later. The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().
Sam Lantinga 2c4a6ea0 2015-05-26T06:27:46 Updated the copyright year to 2015
Ryan C. Gordon b72938c8 2015-04-20T12:22:44 Windows: Always set the system timer resolution to 1ms by default. An existing hint lets apps that don't need the timer resolution changed avoid this, to save battery, etc, but this fixes several problems in timing, audio callbacks not firing fast enough, etc. Fixes Bugzilla #2944.
Alex Szpakowski fe6c797c 2015-04-10T23:30:31 Fixed an iOS view orientation issue when SDL_GL_CreateContext or SDL_CreateRenderer is called.
Edward Rudd b88ca1b4 2015-02-10T16:28:56 the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here. Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here. Not 5 or 10 depending on the architecture. More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802
Philipp Wiesemann b48e54aa 2015-01-26T22:00:29 Fixed bug 2802 - [patch] Fix android build compiling in wrong filesystem implementation Jonas Kulla The configure script didn't differentiate between Linux and Android, unconditionally compiling in the unix implementation of SDL_sysfilesystem.c. I'm probably one of the very few people building SDL for android using classic configure + standalone toolchain, so this has gone undetected all along.
David Ludwig 70438be2 2014-12-03T10:55:23 WinRT: fixed bug whereby SDL would override an app's default orientation WinRT apps can set a default, preferred orientation via a .appxmanifest file. SDL was overriding this on app startup, and making the app use all possible orientations (landscape and portrait). Thanks to Eric Wing for the heads up on this!
Philipp Wiesemann 9c398852 2014-11-22T22:20:40 Corrected header file documentation comment.
Pierre-Loup A. Griffais 24c86b55 2014-09-11T19:24:42 [X11] Reconcile logical keyboard state with physical state on FocusIn since the window system doesn't do it for us like other platforms. This prevents sticky keys and missed keys when going in and out of focus, for example Alt would appear to stick if switching away from an SDL app with Alt-Tab and had to be pressed again. CR: Sam
Sam Lantinga 8077bf3d 2014-07-07T21:27:42 Fixed bug 2618 - incomplete pthread-based lock support should be removed binarycrusader Since changeset 358696c354a8, SDL 2.0 has been broken on Solaris when compiling with the Solaris Studio compiler (which uses the pthread implementation of SDL_AtomicLock). Notably, it gets stuck at the MemoryBarrierRelease in SDL_GetErrBuf: 6585 # 218 6586 if (!tls_errbuf && !tls_being_created) { 6587 SDL_AtomicLock_REAL ( & tls_lock ); 6588 if (!tls_errbuf) { 6589 SDL_TLSID slot; 6590 tls_being_created = SDL_TRUE; 6591 slot = SDL_TLSCreate_REAL ( ); 6592 tls_being_created = SDL_FALSE; 6593 { SDL_SpinLock _tmp = 0 ; SDL_AtomicLock_REAL ( & _tmp ) ; SDL_AtomicUnlock_REAL ( & _tmp ) ; }; ^^^ loops forever above 6594 tls_errbuf = slot; 6595 } 6596 SDL_AtomicUnlock_REAL ( & tls_lock ); 6597 } Running: testthread (process id 28926) ^Cdbx: warning: Interrupt ignored but forwarded to child. signal INT (Interrupt) in __nanosleep at 0xfe52a875 0xfe52a875: __nanosleep+0x0015: jae __nanosleep+0x23 [ 0xfe52a883, .+0xe ] Current function is SDL_Delay_REAL 204 was_error = nanosleep(&tv, &elapsed); (dbx) where [1] __nanosleep(0xfeffe848, 0xfeffe850, 0xfe75a5ac, 0xfe5169d8), at 0xfe52a875 [2] nanosleep(0xfeffe848, 0xfeffe850), at 0xfe516a3b =>[3] SDL_Delay_REAL(ms = 0), line 204 in "SDL_systimer.c" [4] SDL_AtomicLock_REAL(lock = 0xfeffe88c), line 104 in "SDL_spinlock.c" [5] SDL_GetErrBuf(), line 225 in "SDL_thread.c" [6] SDL_ClearError_REAL(), line 216 in "SDL_error.c" [7] SDL_InitSubSystem_REAL(flags = 0), line 116 in "SDL.c" [8] SDL_Init_REAL(flags = 0), line 244 in "SDL.c" [9] SDL_Init(a = 0), line 89 in "SDL_dynapi_procs.h" [10] main(argc = 1, argv = 0xfeffe948), line 65 in "testthread.c" As far as I can tell, this is because pthread_spin_trylock() always returns EBUSY for this particular lock; since it works in other places, I'm suspicious. Different Solaris Studio compiler versions seem to make no difference. I've verified this is broken on Linux as well if SDL_spinlock.c is modified to use the pthread implementation. This appears to be because pthread_spin_init() and pthread_spin_destroy() are not used with the locks as required.
Shawn Walker c5812c55 2014-07-05T16:11:23 2620 solaris port missing atomics if not using gcc
David Ludwig 3dcb451f 2014-04-09T21:29:19 Added a README file regarding WinRT support To note, this file is currently formatted with CRLF line endings, rather than LF, to allow the file to be viewed with Notepad.
Sam Lantinga 1367bf87 2014-03-09T11:36:47 Integrated David Ludwig's support for Windows RT
Sam Lantinga 05c23063 2014-03-09T11:06:11 Fixed line endings on WinRT source code
Sam Lantinga 58edac3e 2014-02-02T00:53:27 Fixed bug 2374 - Update copyright for 2014... Is it that time already??
Gabriel Jacobo f848adff 2013-11-29T10:06:08 Improve Android pause/resume behavior.
Ryan C. Gordon 7e1289af 2013-11-24T23:56:17 Make internal SDL sources include SDL_internal.h instead of SDL_config.h The new header will include SDL_config.h, but allows for other global stuff.
David Ludwig 1704af5b 2013-10-27T23:03:11 WinRT: build fixes, post SDL 2.0.1 update
David Ludwig 69c5d21d 2013-10-27T21:26:46 WinRT: merged with SDL 2.0.1 codebase
Sam Lantinga 12ca3ce3 2013-10-17T23:02:29 Fixed building using MinGW Our SDL_windows.h needed to be included before anything else so UNICODE is defined.
David Ludwig f7049b93 2013-08-12T22:29:55 WinRT: merged with SDL 2.0.0 codebase (aka. SDL hg rev d4ce48ff30d1)
Gabriel Jacobo dad42067 2013-08-12T11:13:50 Fixes #2022, do not resume on Android when surfaceChanged If the app is in landscape mode and the user presses the power button, a pause is followed immediately by a surfaceChanged event because the lock screen is shown in portrait mode. This triggers a "false" resume. So, we just pause and resume following the onWindowFocusChanged events. Also, wait for SDL_APP_WILLENTERBACKGROUND and SDL_APP_DIDENTERBACKGROUND before blocking the event pump.
Sam Lantinga 1ad936eb 2013-08-11T19:56:43 Fixed bug 2027 - Full-screen appears to be broken - hang in SDL_DestroyWindow() Rainer Deyke I'm running Linux Mint 15 with the Cinnamon window manager. SDL_DestroyWindow consistently locks up for me when the window if fullscreen.