24 lines
523 B
Plaintext
24 lines
523 B
Plaintext
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cat << EOF
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/**
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* ${atomic}_fetch_add_unless - add unless the number is already a given value
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* @v: pointer of type ${atomic}_t
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* @a: the amount to add to v...
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* @u: ...unless v is equal to u.
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*
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* Atomically adds @a to @v, so long as @v was not already @u.
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* Returns original value of @v
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*/
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static inline ${int}
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${atomic}_fetch_add_unless(${atomic}_t *v, ${int} a, ${int} u)
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{
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${int} c = ${atomic}_read(v);
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do {
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if (unlikely(c == u))
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break;
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} while (!${atomic}_try_cmpxchg(v, &c, c + a));
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return c;
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}
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EOF
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