sbuild
1.7.1
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File lock. More...
#include <lock.h>
Public Member Functions | |
file_lock (int fd) | |
The constructor. More... | |
virtual | ~file_lock () |
The destructor. | |
virtual void | set_lock (lock::type lock_type, unsigned int timeout) |
Acquire a lock. More... | |
virtual void | unset_lock () |
Release a lock. More... | |
Private Attributes | |
int | fd |
The file descriptor to lock. | |
bool | locked |
Is the file locked? | |
Additional Inherited Members | |
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enum | type { LOCK_SHARED = F_RDLCK, LOCK_EXCLUSIVE = F_WRLCK, LOCK_NONE = F_UNLCK } |
Lock type. More... | |
enum | error_code { TIMEOUT_HANDLER, TIMEOUT_SET, TIMEOUT_CANCEL, LOCK, UNLOCK, LOCK_TIMEOUT, UNLOCK_TIMEOUT, DEVICE_LOCK, DEVICE_LOCK_TIMEOUT, DEVICE_TEST, DEVICE_UNLOCK, DEVICE_UNLOCK_TIMEOUT } |
Error codes. More... | |
typedef custom_error< error_code > | error |
Exception type. | |
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lock () | |
The constructor. | |
virtual | ~lock () |
The destructor. | |
void | set_alarm () |
Set the SIGALARM handler. More... | |
void | clear_alarm () |
Restore the state of SIGALRM prior to starting lock acquisition. | |
void | set_timer (const struct itimerval &timer) |
Set up an itimer for future expiry. More... | |
void | unset_timer () |
Remove any itimer currently set up. More... | |
File lock.
Simple whole-file shared and exclusive advisory locking based upon POSIX fcntl byte region locks.
sbuild::file_lock::file_lock | ( | int | fd) |
The constructor.
fd | the file descriptor to lock. |
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virtual |
Acquire a lock.
lock_type | the type of lock to acquire. |
timeout | the time in seconds to wait on the lock. |
Implements sbuild::lock.
References fd, sbuild::lock::LOCK, sbuild::lock::LOCK_EXCLUSIVE, sbuild::lock::LOCK_SHARED, sbuild::lock::LOCK_TIMEOUT, locked, sbuild::lock::set_timer(), sbuild::lock::UNLOCK, sbuild::lock::UNLOCK_TIMEOUT, and sbuild::lock::unset_timer().
Referenced by sbuild::chroot::config::load_data(), sbuild::chroot::facet::session::setup_session_info(), and unset_lock().
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virtual |
Release a lock.
This is equivalent to set_lock with a lock_type of LOCK_NONE and a timeout of 0.
Implements sbuild::lock.
References sbuild::lock::LOCK_NONE, and set_lock().
Referenced by sbuild::chroot::config::load_data(), and sbuild::chroot::facet::session::setup_session_info().