void CInterProcessLock::Unlock()
{
if (m_Handle == kInvalidLockHandle) {
NCBI_THROW(CInterProcessLockException, eNotLocked,
"Attempt to unlock not-yet-acquired lock");
}
CFastMutexGuard LOCK(s_ProcessLock);
// Check that lock with specified name not already locked
// in the current process.
TLocks::iterator it = s_Locks->find(m_SystemName);
_VERIFY(it != s_Locks->end());
if ( it->second > 1 ) {
// Just decrease reference counter
it->second--;
return;
}
// Release lock
#if defined(NCBI_OS_UNIX)
# if defined(F_TLOCK)
int res = lockf(m_Handle, F_ULOCK, 0);
# elif defined(F_SETLK)
struct flock lockparam;
lockparam.l_type = F_UNLCK;
lockparam.l_whence = SEEK_SET;
lockparam.l_start = 0;
lockparam.l_len = 0; /* whole file */
int res = fcntl(m_Handle, F_SETLK, &lockparam);
# else
# error "No supported lock method. Please port this code."
# endif
if ( res < 0 ) {
NCBI_THROW(CInterProcessLockException, eUnlockError,
"Cannot release the lock");
}
close(m_Handle);
#elif defined(NCBI_OS_MSWIN)
if ( !::ReleaseMutex(m_Handle) ) {
NCBI_THROW(CInterProcessLockException, eUnlockError,
"Cannot release the lock");
}
::CloseHandle(m_Handle);
#endif
m_Handle = kInvalidLockHandle;
s_Locks->erase(m_SystemName);
}
