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libthread: fix nbrecvul, recvul to match man page, Plan 9

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They return 0 on failure, not -1.
Bug introduced in my original libthread-for-Unix code.

Fixes #230.
This commit is contained in:
Russ Cox 2020-01-13 17:00:27 -05:00
parent 93f9789c04
commit 369923f6fc
1 changed files with 2 additions and 2 deletions
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4
src/libthread/channel.c
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@ -397,7 +397,7 @@ chanrecvul(Channel *c)
if(_chanop(c, CHANRCV, &val, 1) > 0) if(_chanop(c, CHANRCV, &val, 1) > 0)
return val; return val;
return -1; return 0;
} }
int int
@ -413,5 +413,5 @@ channbrecvul(Channel *c)
if(_chanop(c, CHANRCV, &val, 0) > 0) if(_chanop(c, CHANRCV, &val, 0) > 0)
return val; return val;
return -1; return 0;
} }