xnu-3248.60.10.tar.gz

[apple/xnu.git] / bsd / kern / sys_pipe.c

diff --git a/bsd/kern/sys_pipe.c b/bsd/kern/sys_pipe.c
index 374d82381f46dc38b56986ac68bf6a043e894dec..1e64ce7378334adaff46a973580a962064ff1cea 100644 (file)
--- a/bsd/kern/sys_pipe.c
+++ b/bsd/kern/sys_pipe.c
@@ -317,7 +317,7 @@ pipe_touch(struct pipe *tpipe, int touch)
        }
 }
 
-static const unsigned int pipesize_blocks[] = {128,256,1024,2048,4096, 4096 * 2, PIPE_SIZE , PIPE_SIZE * 4 };
+static const unsigned int pipesize_blocks[] = {512,1024,2048,4096, 4096 * 2, PIPE_SIZE , PIPE_SIZE * 4 };
 
 /* 
  * finds the right size from possible sizes in pipesize_blocks 
@@ -329,6 +329,12 @@ choose_pipespace(unsigned long current, unsigned long expected)
        int i = sizeof(pipesize_blocks)/sizeof(unsigned int) -1;
        unsigned long target;
 
+       /*
+        * assert that we always get an atomic transaction sized pipe buffer,
+        * even if the system pipe buffer high-water mark has been crossed.
+        */
+       assert(PIPE_BUF == pipesize_blocks[0]);
+
        if (expected > current) 
                target = expected;
        else