Cairo的多线程支持依旧不给力 - TBY's Blog
Cairo的多线程支持依旧不给力
用Haskell写了个小程序，整合了2种miRNA靶基因预测算法，并设计了图形化展示 方案，但发现性能瓶颈在Cairo绘制上，于是尝试并发写pdf，结果是令人沮丧的：
testIO: cairo-hash.c:506: _cairo_hash_table_lookup_exact_key: Assertion `!"reached"' failed.
已放弃(吐核)
尝试了替换forkIO为forkOS，bug依旧。Haskell程序难以获得完整的栈追踪信息，不过好在这是个assertion failure，有详细的提示，查阅了源文件以后，发现cairo使用了一个静态数据结构来计数。。。囧。。。要知道cairo 1.12.10的release note上可是提到了大幅改进多线程友好度的噢。
其他互联网上与该bug相关的帖子：
1. 2010年的：http://lists.cairographics.org/archives/cairo/2010-December/021321.html
2. 2013年的：http://comments.gmane.org/gmane.comp.lib.cairo/23497
你相信一个使用了静态数据结构的库是线程安全的么？？？不管你信不信，我反正信了！！
2013年2月02日 10:53
嗯，前段时间我用 poppler + cairo 的时候，也遇到了问题。两个线程分别将两份不同的 pdf 页面渲染为 cairo 图像时，程序就时不时的会崩掉。
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