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| author | Mattias Andrée <maandree@operamail.com> | 2014-03-12 02:55:09 +0100 |
|---|---|---|
| committer | Mattias Andrée <maandree@operamail.com> | 2014-03-12 02:55:09 +0100 |
| commit | bf99c560ef952901caa381b07959865189925c2a (patch) | |
| tree | 2d9f248b2c784b4fc1e2703b5318eab0da7c7f50 /examples | |
| parent | type + update todo, drm looks like the solution for not requiring X/Wayland/Mir (diff) | |
| download | blueshift-bf99c560ef952901caa381b07959865189925c2a.tar.gz blueshift-bf99c560ef952901caa381b07959865189925c2a.tar.bz2 blueshift-bf99c560ef952901caa381b07959865189925c2a.tar.xz | |
improve thread safety
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to '')
| -rw-r--r-- | examples/threaded | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/examples/threaded b/examples/threaded index 7b37cce..e70d33e 100644 --- a/examples/threaded +++ b/examples/threaded @@ -22,7 +22,7 @@ gamma_green = [1.15, 1.16] gamma_blue = [1.11, 1.10] -# Make colour curves thread local +# Make colour curves thread local. class threadlocal: def __init__(self, obj): self.default = obj @@ -56,19 +56,24 @@ r_curve = threadlocal([i / (i_size - 1) for i in range(i_size)]) g_curve = threadlocal([i / (i_size - 1) for i in range(i_size)]) b_curve = threadlocal([i / (i_size - 1) for i in range(i_size)]) -## cmf_10deg uses non-thread safe cache, run once in advance so it is not done by the threads +## cmf_10deg uses non-thread safe cache, run once in advance so it is not done by the threads. cmf_10deg(0) -# Thread synchronisation barrier +# Thread synchronisation barrier. barrier = threading.Barrier(len(gamma_red) + 1) # Help functions for colour interpolation. interpol, purify = None, None -# Parameters in `periodically` +# Parameters in `periodically`. fade_ = None +# randr is not threadsafe, and absolutely not if you have multiple screens. +# This semaphore is used to make sure that two threads are not accessing randr at the same time. +flush_semaphore = threading.Semaphore() + + def adjust(m): ''' Adjust monitor colours @@ -97,7 +102,9 @@ def adjust(m): gamma(gamma_red[m], gamma_green[m], gamma_blue[m]) # Flush settings to monitor. + flush_semaphore.acquire() randr(m) + flush_semaphore.release() # Signal thread completion. barrier.wait() |