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1 | /* |
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2 | * swift_backoff.c |
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3 | * |
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4 | * (c) 2009 Ionut Rosoiu <ionut.rosoiu@gmail.com> |
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5 | * |
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6 | */ |
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7 | |
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8 | #include "swift_backoff.h" |
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9 | #include "swift_log.h" |
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10 | #define _POSIX_C_SOURCE 199309L |
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11 | #include <time.h> |
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12 | |
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13 | void swift_backoff(swift_thread_t *thread) { |
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14 | struct timespec req, rem; |
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15 | |
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16 | //TODO: limit backoff (or cycle) |
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17 | req.tv_sec = 0; |
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18 | req.tv_nsec = thread->last_sleep_time; |
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19 | |
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20 | while (nanosleep(&req, &rem) == -1) { |
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21 | req = rem; |
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22 | } |
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23 | |
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24 | thread->last_sleep_time = (thread->last_sleep_time << 1) % 100L; |
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25 | } |
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