| e31bfae2baa96742f998155ee26e56c826a8ce3a |
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15-Nov-2011 |
David 'Digit' Turner <digit@android.com> |
bionic: Do not use <sys/atomics.h> for platform code.
We're going to modify the __atomic_xxx implementation to provide
full memory barriers, to avoid problems for NDK machine code that
link to these functions.
First step is to remove their usage from our platform code.
We now use inlined versions of the same functions for a slight
performance boost.
+ remove obsolete atomics_x86.c (was never compiled)
NOTE: This improvement was benchmarked on various devices.
Comparing a pthread mutex lock + atomic increment + unlock
we get:
- ARMv7 emulator, running on a 2.4 GHz Xeon:
before: 396 ns after: 288 ns
- x86 emulator in KVM mode on same machine:
before: 27 ns after: 27 ns
- Google Nexus S, in ARMv7 mode (single-core):
before: 82 ns after: 76 ns
- Motorola Xoom, in ARMv7 mode (multi-core):
before: 121 ns after: 120 ns
The code has also been rebuilt in ARMv5TE mode for correctness.
Change-Id: Ic1dc72b173d59b2e7af901dd70d6a72fb2f64b17
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| 519763265ec0b634bd9c264a0aca034882458ecc |
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28-Jun-2010 |
David 'Digit' Turner <digit@google.com> |
libc: Fix sem_post() implementation to wake up all waiting threads.
This also allows us to optimize the case where we increment an
uncontended semaphore (no need to call futex_wake() then).
Change-Id: Iad48efe8551dc66dc89d3e3f18c001e5a6c1939f
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| 6c8a2f2a5bc8d612ee953f528f2b5eb35983656a |
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11-Jun-2010 |
David 'Digit' Turner <digit@google.com> |
libc: remove cutils dependencies
We simply copy the stuff we need from cutils headers.
A future patch will change cutils to include the private <bionic_atomic_inline.h>
Change-Id: Ib6fd9a03bc9e337ce867bd606dc94c2b4438480a
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| 6304d8b21891fd0cb7b5a4c25159a3d3b1709d62 |
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03-Jun-2010 |
David 'Digit' Turner <digit@google.com> |
Use private futexes for semaphores, unless they are initialized with pshared != 0.
Change-Id: I534e36a7171cd37037ae03b910ba71ea6968286d
Note: previously, sem_init() would return an error if pshared != 0.
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| 7c99c1856fce65c0394cd578c2a8ed37da2f288d |
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28-May-2010 |
Andy McFadden <fadden@android.com> |
Atomic/SMP update, part 3. (manual merge)
Update ARM atomic ops to use LDREX/STREX. Stripped out #if 0 chunk.
Insert explicit memory barriers in pthread and semaphore code.
For bug 2721865.
Change-Id: I595cc8e5a8d1e4906b6641115e46208a7e9e755a
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| fcd00ebbdf3e7f4e1e7782a65ae10fb0fc03a1aa |
|
28-May-2010 |
Andy McFadden <fadden@android.com> |
Atomic/SMP update, part 3.
Update ARM atomic ops to use LDREX/STREX. Stripped out #if 0 chunk.
Insert explicit memory barriers in pthread and semaphore code.
For bug 2721865.
Change-Id: I0f153b797753a655702d8be41679273d1d5d6ae7
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| 4f920f685bb4af8400c70383eecf347a35353778 |
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12-Feb-2010 |
David 'Digit' Turner <digit@google.com> |
Fix sem_post() behaviour to wake up multiple waiting threads.
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| 294dd0b86b1484aec7549663aff5b19c98a4b7fd |
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12-Feb-2010 |
David 'Digit' Turner <digit@google.com> |
Fix sem_trywait() implementation + update changelog.
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| 1dc9e472e19acfe6dc7f41e429236e7eef7ceda1 |
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04-Mar-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //depot/cupcake/@135843
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| 1767f908af327fa388b1c66883760ad851267013 |
|
04-Mar-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //depot/cupcake/@135843
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| d37527501c85edcb3a6a7c8a0b6297d52d434897 |
|
20-Jan-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //branches/cupcake/...@127101
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| a27d2baa0c1a2ec70f47ea9199b1dd6762c8a349 |
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21-Oct-2008 |
The Android Open Source Project <initial-contribution@android.com> |
Initial Contribution
|