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Re: [Qemu-devel] [RFC PATCH v8 05/21] replay: introduce mutex to protect
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [RFC PATCH v8 05/21] replay: introduce mutex to protect the replay log |
Date: |
Thu, 29 Jan 2015 10:12:42 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
On 22/01/2015 09:51, Pavel Dovgalyuk wrote:
> This mutex will protect read/write operations for replay log.
> Using mutex is necessary because most of the events consist of
> several fields stored in the log. The mutex will help to avoid races.
>
> Signed-off-by: Pavel Dovgalyuk <address@hidden>
> ---
> replay/replay-internal.c | 25 +++++++++++++++++++++++++
> replay/replay-internal.h | 7 +++++++
> 2 files changed, 32 insertions(+), 0 deletions(-)
>
> diff --git a/replay/replay-internal.c b/replay/replay-internal.c
> index 3865fa5..f552dad 100755
> --- a/replay/replay-internal.c
> +++ b/replay/replay-internal.c
> @@ -15,6 +15,11 @@
> unsigned int replay_data_kind = -1;
> unsigned int replay_has_unread_data;
>
> +/* Mutex to protect reading and writing events to the log.
> + replay_data_kind and replay_has_unread_data are also protected
> + by this mutex. */
> +static QemuMutex lock;
> +
> /* File for replay writing */
> FILE *replay_file;
>
> @@ -139,3 +144,23 @@ void replay_fetch_data_kind(void)
> }
> }
> }
> +
> +void replay_mutex_init(void)
> +{
> + qemu_mutex_init(&lock);
> +}
> +
> +void replay_mutex_destroy(void)
> +{
> + qemu_mutex_destroy(&lock);
> +}
Destroy is probably not necessary.
> +void replay_mutex_lock(void)
> +{
> + qemu_mutex_lock(&lock);
> +}
> +
> +void replay_mutex_unlock(void)
> +{
> + qemu_mutex_unlock(&lock);
> +}
> diff --git a/replay/replay-internal.h b/replay/replay-internal.h
> index dad5bc8..50ce29b 100755
> --- a/replay/replay-internal.h
> +++ b/replay/replay-internal.h
> @@ -34,6 +34,13 @@ int64_t replay_get_qword(void);
> void replay_get_array(uint8_t *buf, size_t *size);
> void replay_get_array_alloc(uint8_t **buf, size_t *size);
>
> +/* Mutex functions for protecting replay log file */
> +
> +void replay_mutex_init(void);
> +void replay_mutex_destroy(void);
> +void replay_mutex_lock(void);
> +void replay_mutex_unlock(void);
> +
> /*! Checks error status of the file. */
> void replay_check_error(void);
>
>
Reviewed-by: Paolo Bonzini <address@hidden>
- [Qemu-devel] [RFC PATCH v8 00/21] Deterministic replay core, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 01/21] i386: partial revert of interrupt poll fix, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 02/21] replay: global variables and function stubs, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 03/21] sysemu: system functions for replay, Pavel Dovgalyuk, 2015/01/22
- [Qemu-devel] [RFC PATCH v8 05/21] replay: introduce mutex to protect the replay log, Pavel Dovgalyuk, 2015/01/22
- Re: [Qemu-devel] [RFC PATCH v8 05/21] replay: introduce mutex to protect the replay log,
Paolo Bonzini <=
- [Qemu-devel] [RFC PATCH v8 04/21] replay: internal functions for replay log, Pavel Dovgalyuk, 2015/01/22
[Qemu-devel] [RFC PATCH v8 06/21] replay: introduce icount event, Pavel Dovgalyuk, 2015/01/22
[Qemu-devel] [RFC PATCH v8 07/21] cpu-exec: allow temporary disabling icount, Pavel Dovgalyuk, 2015/01/22
[Qemu-devel] [RFC PATCH v8 08/21] cpu: replay instructions sequence, Pavel Dovgalyuk, 2015/01/22