Thread synchronization#
syscalls_phMutexCreate
#
GETFROMSTACK(ustack, unsigned int *, h, 0);
GETFROMSTACK(ustack, const struct lockAttr *, attr, 1);
Creates mutex and returns resource handle h
. Mutex attributes are specified in attr
structure.
syscalls_mutexLock
(syscalls_phMutexLock
)#
GETFROMSTACK(ustack, unsigned int, h, 0);
Locks mutex given by handle h
.
syscalls_mutexTry
#
GETFROMSTACK(ustack, unsigned int, h, 0);
Tries to lock mutex given by handle h
.
syscalls_mutexUnlock
#
GETFROMSTACK(ustack, unsigned int, h, 0);
Unlocks mutex given by h
.
syscalls_phCondCreate
#
GETFROMSTACK(ustack, unsigned int *, h, 0);
GETFROMSTACK(ustack, const struct condAttr *, attr, 1);
Creates conditional variable and returns its handle in variable h
. Conditional variable attributes are specified in
attr
structure.
syscalls_condWait
(syscalls_phCondWait
)#
GETFROMSTACK(ustack, unsigned int, h, 0);
GETFROMSTACK(ustack, unsigned int, m, 1);
GETFROMSTACK(ustack, time_t, timeout, 2);
Waits on conditional given by ‘h’ for number of microseconds given by timeout
. Before suspending a calling thread
execution mutex identified by m
handle is unlocked to enable other thread modifying variables used to
check conditionals after conditional signalization. When conditional variable is signaled mutex m
is locked.
Libc wrapper: int condWait(handle_t h, handle_t m, time_t timeout)
syscalls_condSignal
#
GETFROMSTACK(ustack, unsigned int, h, 0);
Signals conditional given by h
.
syscalls_condBroadcast
#
GETFROMSTACK(ustack, unsigned int, h, 0);
Signals conditional to all waiting threads.