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+ Fri, 09 Sep 2011 11:27:55 +0200\r
+From: Sebastian Spaeth <Sebastian@sspaeth.de>\r
+To: Austin Clements <amdragon@MIT.EDU>\r
+Subject: Re: Memory management practices\r
+In-Reply-To: <20110908151557.GM5688@mit.edu>\r
+References: <8739h1pbaq.fsf@gmail.com> <87pqjprzu2.fsf@gmail.com>\r
+ <20110829183010.GA2605@24f89f8c-e6a1-4e75-85ee-bb8a3743bb9f>\r
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+Date: Fri, 09 Sep 2011 11:27:55 +0200\r
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+Cc: Bertram Felgenhauer <bertram.felgenhauer@googlemail.com>,\r
+ Bart Massey <bart@cs.pdx.edu>, notmuch <notmuch@notmuchmail.org>\r
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+\r
+--=-=-=\r
+\r
+On Thu, 8 Sep 2011 11:15:57 -0400, Austin Clements <amdragon@MIT.EDU> wrote:\r
+> In general, a garbage collector can't make any guarantees about\r
+> finalization order. When a collection of objects all become\r
+> unreachable simultaneously (for example, the last reference to any\r
+> Messages object is dropped, causing the Query object and the Message\r
+> object to both become unreachable), the garbage collector *could*\r
+> finalize the Query first (causing talloc to free the\r
+> notmuch_messages_t) and then the Messages object (causing it to\r
+> crash). There's no guarantee in general because, in the presence of\r
+> cycles, there is no meaningful finalization order.\r
+\r
+Right, but that should not pose a problem for python. If e.g. both a\r
+Query and derived Message objects become unreachable, the python objects\r
+would not care which object is ditched and deleted first. Currently, it\r
+seems that we finalize the Messages first, and the Query second. But we\r
+would not fail if the Query were finalized first. Granted, the\r
+underlying libnotmuch Message objects were torn away while the python\r
+Message objects were still around. But they would ultimately also be\r
+sweeped away, and that would not cause any problems.\r
+\r
+But I am sure that I am missing out something. I'll leave this\r
+discussion to the pros :-).\r
+\r
+Sebastian\r
+\r
+--=-=-=\r
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+--=-=-=--\r
projects / notmuch-archives.git / commitdiff