/usr/share/julia/base/lock.jl is in julia-common 0.4.7-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | # This file is a part of Julia. License is MIT: http://julialang.org/license
# Advisory reentrant lock
type ReentrantLock
locked_by::Nullable{Task}
cond_wait::Condition
reentrancy_cnt::Int
ReentrantLock() = new(nothing, Condition(), 0)
end
function lock(rl::ReentrantLock)
t = current_task()
while true
if rl.reentrancy_cnt == 0
rl.locked_by = t
rl.reentrancy_cnt = 1
return
elseif t == get(rl.locked_by)
rl.reentrancy_cnt += 1
return
end
wait(rl.cond_wait)
end
end
function unlock(rl::ReentrantLock)
rl.reentrancy_cnt = rl.reentrancy_cnt - 1
if rl.reentrancy_cnt < 0
error("unlock count must match lock count")
end
if rl.reentrancy_cnt == 0
rl.locked_by = nothing
notify(rl.cond_wait)
end
return rl
end
type Semaphore
sem_size::Int
curr_cnt::Int
cond_wait::Condition
Semaphore(sem_size) = new(sem_size, 0, Condition())
end
function acquire(s::Semaphore)
while true
if s.curr_cnt < s.sem_size
s.curr_cnt = s.curr_cnt + 1
return
else
wait(s.cond_wait)
end
end
end
function release(s::Semaphore)
s.curr_cnt = s.curr_cnt - 1
notify(s.cond_wait; all=false)
end
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