Last change
on this file since 8dc6f84 was
1bcbf02,
checked in by Thierry Delisle <tdelisle@…>, 2 years ago
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Changed declarations using _Thread_local to use thread.
I'm fairly sure they do exactly the same, but thread is:
- more consistent with uC++.
- Shorter.
- Better documented.
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-
Property mode set to
100644
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File size:
795 bytes
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Line | |
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1 | #include <stdbool.h> |
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2 | #include <stdio.h> |
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3 | |
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4 | #include "bench.h" |
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5 | |
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6 | // Does not do a fetch & add. It mimics the cfa protocol to disable interrupts locally, by writing true or false to a |
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7 | // thread_local Boolean. This means the entire protocol is just to "mov" instructions making it extremely cheap. |
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8 | |
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9 | __thread volatile bool value; |
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10 | |
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11 | void __attribute__((noinline)) do_call() { |
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12 | __atomic_store_n( &value, true, __ATOMIC_RELAXED ); |
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13 | __atomic_signal_fence(__ATOMIC_ACQUIRE); |
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14 | asm volatile (""); |
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15 | __atomic_store_n( &value, false, __ATOMIC_RELAXED ); |
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16 | __atomic_signal_fence(__ATOMIC_RELEASE); |
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17 | } |
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18 | |
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19 | int main( int argc, char * argv[] ) { |
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20 | BENCH_START() |
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21 | BENCH( |
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22 | for (size_t i = 0; i < times; i++) { |
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23 | do_call(); |
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24 | }, |
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25 | result |
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26 | ) |
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27 | printf( "%g\n", result ); |
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28 | } |
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29 | |
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30 | // Local Variables: // |
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31 | // tab-width: 4 // |
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32 | // End: // |
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