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31 Commits

Author SHA1 Message Date
Cameron Gutman 014f507c40 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.
 2021-01-03 12:13:40 -06:00
Cameron Gutman 59594a7891 Implement PAUSE_INSTRUCTION() for Windows ARM platforms 2021-01-02 13:43:04 -06:00
Sam Lantinga 9130f7c377 Updated copyright for 2021 2021-01-02 10:25:38 -08:00
Sam Lantinga d25eff6505 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
 2021-01-02 10:06:22 -08:00
Sam Lantinga 6bd4c717a1 Fixed bug 5402 - ARM support little update proposal 
David Carlier

No fix but mostly an update for ARM architecture.
 2020-12-17 21:41:23 -08:00
Cameron Cawley 8f1a916ac5 Add basic support for compiling on RISC OS 2020-02-13 20:50:47 +00:00
Sam Lantinga a8780c6a28 Updated copyright date for 2020 2020-01-16 20:49:25 -08:00
Cameron Cawley 85aabec27e atomic: Support compiling on ARMv3 2019-10-11 22:08:53 +01:00
Sam Lantinga 959cfc428e Fixed memory barrier macro check so it isn't quite so fragile 2019-06-30 23:58:31 -07:00
Sam Lantinga a8bea85810 Limit the compile error to the case where we actually define the memory barrier macro as the function 2019-06-30 23:55:28 -07:00
Sam Lantinga cc47810d36 Fixed bug 4683 - SDL_atomic infinite recursion on armv6/armv5 w/ thumb 
The real problem is that SDL_atomic.c was built in thumb mode instead of ARM mode, which is required to use the mcr instruction on ARM platforms. Added a compiler error to catch this case so we don't generate code that does infinite recursion.

I also added a potentially better way to handle things on Linux ARM platforms, based on comments in the Chromium headers, which we can try out after 2.0.10 ships.
 2019-06-30 23:26:16 -07:00
Sam Lantinga 5e13087b0f Updated copyright for 2019 2019-01-04 22:01:14 -08:00
Ozkan Sezer d9fb77a3c1 SDL_atomic.c, SDL_spinlock.c: use lock prefix with xchg in Watcom asm. 2018-09-27 11:55:02 +03:00
Ozkan Sezer 949b8bd8c5 correct the comment correction.. 2018-06-30 20:10:40 +03:00
Ozkan Sezer 67f18a1973 comment correction 2018-06-30 20:04:01 +03:00
Ryan C. Gordon 52857de251 Corrected a comment. 2018-06-29 16:55:55 -04:00
Ryan C. Gordon 3b173f818d Patched to compile on Visual Studio (typo). 2018-06-25 23:00:38 -04:00
Ryan C. Gordon 58168a8c3c atomic: Fight with all the assemblers that don't like REP NOP. :/ 2018-06-25 16:34:16 -04:00
Ryan C. Gordon 5f123e31a3 atomic: Spin locks now try to use the x86 PAUSE instruction for short waits. 
Fixes Bugzilla #4151.
 2018-06-25 15:58:35 -04:00
Sam Lantinga e3cc5b2c6b Updated copyright for 2018 2018-01-03 10:03:25 -08:00
Ozkan Sezer 500378eb52 Add atomics for Watcom/x86 as inline asm 
Partially fixes Bugzilla #3758.
 2017-08-18 16:35:55 -04:00
Ryan C. Gordon 1d1a0d7f03 atomic: Patched to compile on Android. 2017-04-13 15:28:56 -04:00
Ryan C. Gordon 1c9c7633d9 atomic: favor compiler intrinsics for compare-and-swap over macOS APIs. 
The OSAtomicCompareAndSwap* APIs are deprecated as of macOS 10.12.
 2017-04-13 13:28:52 -04:00
Ryan C. Gordon 8c00de57f6 atomic: let Clang always use atomic_load_n if available. 
(Apple's Clang reports itself as GCC 4.2.1 in preprocessor macros--the final
GNU C compiler Apple shipped--as of the macOS 10.12 SDK.)
 2017-04-13 13:22:23 -04:00
Sam Lantinga 7891e72dca __atomic_load_n() appears to be available in GCC 5 but not GCC 4 2017-03-30 06:52:34 -07:00
Ryan C. Gordon f2179944cc Patched to compile on some platforms. 2017-03-29 12:04:17 -04:00
James Legg 1dc9ae5c1e Use GCC's atomic loads in SDL_AtomicGet and SDL_AtomicGetPtr 
This fixes errors reported by address sanitizer, and generates simpler
code on x86 architectures.
 2017-03-29 15:48:22 +01:00
Sam Lantinga 06ccb71bcd Make sure the memory barrier functions are always available, and now they are implemented on Android __ARM_ARCH_5TE__ 2017-02-10 11:21:15 -08:00
Sam Lantinga 45b774e3f7 Updated copyright for 2017 2017-01-01 18:33:28 -08:00
Sam Lantinga 42065e785d Updated copyright to 2016 2016-01-02 10:10:34 -08:00
Philipp Wiesemann 0e45984fa0 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().
 2015-06-21 17:33:46 +02:00