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MINOR: fd: Add fd_lock_tgid_cur().

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Add fd_lock_tgid_cur(), a function that will lock the tgid, without
modifying its value.
This commit is contained in:
Olivier Houchard 2025-01-29 17:03:52 +01:00 committed by Olivier Houchard
parent 52b97ff8dd
commit c5cc09c00d
1 changed files with 14 additions and 0 deletions
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14
include/haproxy/fd.h
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@ -364,6 +364,20 @@ static inline void fd_lock_tgid(int fd, uint desired_tgid)
} }
} }
/*
* Try to lock the tgid, keeping the current tgid value.
* Returns 1 on success, or 0 on failure.
*/
static inline int fd_lock_tgid_cur(int fd)
{
uint old = _HA_ATOMIC_LOAD(&fdtab[fd].refc_tgid) & 0x7fff;
if (_HA_ATOMIC_CAS(&fdtab[fd].refc_tgid, &old, (old | 0x8000) + 0x10000))
return 1;
return 0;
}
/* Grab a reference to the FD's TGID, and return the tgid. Note that a TGID of /* Grab a reference to the FD's TGID, and return the tgid. Note that a TGID of
* zero indicates the FD was closed, thus also fails (i.e. no need to drop it). * zero indicates the FD was closed, thus also fails (i.e. no need to drop it).
* On non-zero (success), the caller must release it using fd_drop_tgid(). * On non-zero (success), the caller must release it using fd_drop_tgid().