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futex.2: Fix a bug in the example 

The man page contains a trivial bug that's discussed here:
https://stackoverflow.com/q/59628958

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Ponnuvel Palaniyappan 2020-01-08 09:09:48 +00:00 committed by Michael Kerrisk
parent 4897b19d4e
commit 09e456c2d0
1 changed files with 4 additions and 4 deletions
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8
man2/futex.2
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@ -1797,8 +1797,8 @@ fwait(int *futexp)
while (1) {
/* Is the futex available? */
const int zero = 0;
if (atomic_compare_exchange_strong(futexp, &zero, 1))
const int one = 1;
if (atomic_compare_exchange_strong(futexp, &one, 0))
break; /* Yes */
/* Futex is not available; wait */
@ -1820,8 +1820,8 @@ fpost(int *futexp)
/* atomic_compare_exchange_strong() was described in comments above */
const int one = 1;
if (atomic_compare_exchange_strong(futexp, &one, 0)) {
const int zero = 0;
if (atomic_compare_exchange_strong(futexp, &zero, 1)) {
s = futex(futexp, FUTEX_WAKE, 1, NULL, NULL, 0);
if (s == \-1)
errExit("futex\-FUTEX_WAKE");