)]}'
{
  "commit": "1791f881435fab951939ad700e947b66c062e083",
  "tree": "53739cfe3847e425b9bb64f22bc7526da26a9a0c",
  "parents": [
    "a1b49cb7e2a7961ec3aa8b64860bf480d4ec9077"
  ],
  "author": {
    "name": "Richard Cochran",
    "email": "richardcochran@gmail.com",
    "time": "Wed Mar 30 15:24:21 2011 +0200"
  },
  "committer": {
    "name": "Thomas Gleixner",
    "email": "tglx@linutronix.de",
    "time": "Mon Apr 18 10:39:38 2011 +0200"
  },
  "message": "posix clocks: Replace mutex with reader/writer semaphore\n\nA dynamic posix clock is protected from asynchronous removal by a mutex.\nHowever, using a mutex has the unwanted effect that a long running clock\noperation in one process will unnecessarily block other processes.\n\nFor example, one process might call read() to get an external time stamp\ncoming in at one pulse per second. A second process calling clock_gettime\nwould have to wait for almost a whole second.\n\nThis patch fixes the issue by using a reader/writer semaphore instead of\na mutex.\n\nSigned-off-by: Richard Cochran \u003crichard.cochran@omicron.at\u003e\nCc: John Stultz \u003cjohn.stultz@linaro.org\u003e\nLink: http://lkml.kernel.org/r/%3C20110330132421.GA31771%40riccoc20.at.omicron.at%3E\nSigned-off-by: Thomas Gleixner \u003ctglx@linutronix.de\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "369e19d3750ba9ac4365cf8e778d61f6a9e239a5",
      "old_mode": 33188,
      "old_path": "include/linux/posix-clock.h",
      "new_id": "7f1183dcd119e0e25dfd959827364e30f7ee291c",
      "new_mode": 33188,
      "new_path": "include/linux/posix-clock.h"
    },
    {
      "type": "modify",
      "old_id": "25028dd4fa18044846caa1098bf87b28c1c81be4",
      "old_mode": 33188,
      "old_path": "kernel/time/posix-clock.c",
      "new_id": "c340ca658f37a0c09726a31a6f126f18c9380355",
      "new_mode": 33188,
      "new_path": "kernel/time/posix-clock.c"
    }
  ]
}