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git/fsmonitor--daemon.h

172 lines
5.7 KiB

#ifndef FSMONITOR_DAEMON_H
#define FSMONITOR_DAEMON_H
#ifdef HAVE_FSMONITOR_DAEMON_BACKEND
#include "cache.h"
#include "dir.h"
#include "run-command.h"
#include "simple-ipc.h"
#include "thread-utils.h"
struct fsmonitor_batch;
struct fsmonitor_token_data;
/*
* Create a new batch of path(s). The returned batch is considered
* private and not linked into the fsmonitor daemon state. The caller
* should fill this batch with one or more paths and then publish it.
*/
struct fsmonitor_batch *fsmonitor_batch__new(void);
/*
* Free the list of batches starting with this one.
*/
void fsmonitor_batch__free_list(struct fsmonitor_batch *batch);
/*
* Add this path to this batch of modified files.
*
* The batch should be private and NOT (yet) linked into the fsmonitor
* daemon state and therefore not yet visible to worker threads and so
* no locking is required.
*/
void fsmonitor_batch__add_path(struct fsmonitor_batch *batch, const char *path);
struct fsm_listen_data; /* opaque platform-specific data for listener thread */
fsmonitor--daemon: stub in health thread Create another thread to watch over the daemon process and automatically shut it down if necessary. This commit creates the basic framework for a "health" thread to monitor the daemon and/or the file system. Later commits will add platform-specific code to do the actual work. The "health" thread is intended to monitor conditions that would be difficult to track inside the IPC thread pool and/or the file system listener threads. For example, when there are file system events outside of the watched worktree root or if we want to have an idle-timeout auto-shutdown feature. This commit creates the health thread itself, defines the thread-proc and sets up the thread's event loop. It integrates this new thread into the existing IPC and Listener thread models. This commit defines the API to the platform-specific code where all of the monitoring will actually happen. The platform-specific code for MacOS is just stubs. Meaning that the health thread will immediately exit on MacOS, but that is OK and expected. Future work can define MacOS-specific monitoring. The platform-specific code for Windows sets up enough of the WaitForMultipleObjects() machinery to watch for system and/or custom events. Currently, the set of wait handles only includes our custom shutdown event (sent from our other theads). Later commits in this series will extend the set of wait handles to monitor other conditions. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
4 months ago
struct fsm_health_data; /* opaque platform-specific data for health thread */
struct fsmonitor_daemon_state {
pthread_t listener_thread;
fsmonitor--daemon: stub in health thread Create another thread to watch over the daemon process and automatically shut it down if necessary. This commit creates the basic framework for a "health" thread to monitor the daemon and/or the file system. Later commits will add platform-specific code to do the actual work. The "health" thread is intended to monitor conditions that would be difficult to track inside the IPC thread pool and/or the file system listener threads. For example, when there are file system events outside of the watched worktree root or if we want to have an idle-timeout auto-shutdown feature. This commit creates the health thread itself, defines the thread-proc and sets up the thread's event loop. It integrates this new thread into the existing IPC and Listener thread models. This commit defines the API to the platform-specific code where all of the monitoring will actually happen. The platform-specific code for MacOS is just stubs. Meaning that the health thread will immediately exit on MacOS, but that is OK and expected. Future work can define MacOS-specific monitoring. The platform-specific code for Windows sets up enough of the WaitForMultipleObjects() machinery to watch for system and/or custom events. Currently, the set of wait handles only includes our custom shutdown event (sent from our other theads). Later commits in this series will extend the set of wait handles to monitor other conditions. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
4 months ago
pthread_t health_thread;
pthread_mutex_t main_lock;
struct strbuf path_worktree_watch;
struct strbuf path_gitdir_watch;
int nr_paths_watching;
struct fsmonitor_token_data *current_token_data;
struct strbuf path_cookie_prefix;
pthread_cond_t cookies_cond;
int cookie_seq;
struct hashmap cookies;
int listen_error_code;
fsmonitor--daemon: stub in health thread Create another thread to watch over the daemon process and automatically shut it down if necessary. This commit creates the basic framework for a "health" thread to monitor the daemon and/or the file system. Later commits will add platform-specific code to do the actual work. The "health" thread is intended to monitor conditions that would be difficult to track inside the IPC thread pool and/or the file system listener threads. For example, when there are file system events outside of the watched worktree root or if we want to have an idle-timeout auto-shutdown feature. This commit creates the health thread itself, defines the thread-proc and sets up the thread's event loop. It integrates this new thread into the existing IPC and Listener thread models. This commit defines the API to the platform-specific code where all of the monitoring will actually happen. The platform-specific code for MacOS is just stubs. Meaning that the health thread will immediately exit on MacOS, but that is OK and expected. Future work can define MacOS-specific monitoring. The platform-specific code for Windows sets up enough of the WaitForMultipleObjects() machinery to watch for system and/or custom events. Currently, the set of wait handles only includes our custom shutdown event (sent from our other theads). Later commits in this series will extend the set of wait handles to monitor other conditions. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
4 months ago
int health_error_code;
struct fsm_listen_data *listen_data;
fsmonitor--daemon: stub in health thread Create another thread to watch over the daemon process and automatically shut it down if necessary. This commit creates the basic framework for a "health" thread to monitor the daemon and/or the file system. Later commits will add platform-specific code to do the actual work. The "health" thread is intended to monitor conditions that would be difficult to track inside the IPC thread pool and/or the file system listener threads. For example, when there are file system events outside of the watched worktree root or if we want to have an idle-timeout auto-shutdown feature. This commit creates the health thread itself, defines the thread-proc and sets up the thread's event loop. It integrates this new thread into the existing IPC and Listener thread models. This commit defines the API to the platform-specific code where all of the monitoring will actually happen. The platform-specific code for MacOS is just stubs. Meaning that the health thread will immediately exit on MacOS, but that is OK and expected. Future work can define MacOS-specific monitoring. The platform-specific code for Windows sets up enough of the WaitForMultipleObjects() machinery to watch for system and/or custom events. Currently, the set of wait handles only includes our custom shutdown event (sent from our other theads). Later commits in this series will extend the set of wait handles to monitor other conditions. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
4 months ago
struct fsm_health_data *health_data;
struct ipc_server_data *ipc_server_data;
struct strbuf path_ipc;
};
/*
* Pathname classifications.
*
* The daemon classifies the pathnames that it receives from file
* system notification events into the following categories and uses
* that to decide whether clients are told about them. (And to watch
* for file system synchronization events.)
*
* The daemon only collects and reports on the set of modified paths
* within the working directory (proper).
*
* The client should only care about paths within the working
* directory proper (inside the working directory and not ".git" nor
* inside of ".git/"). That is, the client has read the index and is
* asking for a list of any paths in the working directory that have
* been modified since the last token. The client does not care about
* file system changes within the ".git/" directory (such as new loose
* objects or packfiles). So the client will only receive paths that
* are classified as IS_WORKDIR_PATH.
*
* Note that ".git" is usually a directory and is therefore inside
* the cone of the FS watch that we have on the working directory root,
* so we will also get FS events for disk activity on and within ".git/"
* that we need to respond to or filter from the client.
*
* But Git also allows ".git" to be a *file* that points to a GITDIR
* outside of the working directory. When this happens, we need to
* create FS watches on both the working directory root *and* on the
* (external) GITDIR root. (The latter is required because we put
* cookie files inside it and use them to sync with the FS event
* stream.)
*
* Note that in the context of this discussion, I'm using "GITDIR"
* to only mean an external GITDIR referenced by a ".git" file.
*
* The platform FS event backends will receive watch-specific
* relative paths (except for those OS's that always emit absolute
* paths). We use the following enum and routines to classify each
* path so that we know how to handle it. There is a slight asymmetry
* here because ".git/" is inside the working directory and the
* (external) GITDIR is not, and therefore how we handle events may
* vary slightly, so I have different enums for "IS...DOT_GIT..." and
* "IS...GITDIR...".
*
* The daemon uses the IS_DOT_GIT and IS_GITDIR internally to mean the
* exact ".git" file/directory or GITDIR directory. If the daemon
* receives a delete event for either of these paths, it will
* automatically shutdown, for example.
*
* Note that the daemon DOES NOT explicitly watch nor special case the
* index. The daemon does not read the index nor have any internal
* index-relative state, so there are no "IS...INDEX..." enum values.
*/
enum fsmonitor_path_type {
IS_WORKDIR_PATH = 0,
IS_DOT_GIT,
IS_INSIDE_DOT_GIT,
IS_INSIDE_DOT_GIT_WITH_COOKIE_PREFIX,
IS_GITDIR,
IS_INSIDE_GITDIR,
IS_INSIDE_GITDIR_WITH_COOKIE_PREFIX,
IS_OUTSIDE_CONE,
};
/*
* Classify a pathname relative to the root of the working directory.
*/
enum fsmonitor_path_type fsmonitor_classify_path_workdir_relative(
const char *relative_path);
/*
* Classify a pathname relative to a <gitdir> that is external to the
* worktree directory.
*/
enum fsmonitor_path_type fsmonitor_classify_path_gitdir_relative(
const char *relative_path);
/*
* Classify an absolute pathname received from a filesystem event.
*/
enum fsmonitor_path_type fsmonitor_classify_path_absolute(
struct fsmonitor_daemon_state *state,
const char *path);
/*
* Prepend the this batch of path(s) onto the list of batches associated
* with the current token. This makes the batch visible to worker threads.
*
* The caller no longer owns the batch and must not free it.
*
* Wake up the client threads waiting on these cookies.
*/
void fsmonitor_publish(struct fsmonitor_daemon_state *state,
struct fsmonitor_batch *batch,
const struct string_list *cookie_names);
/*
* If the platform-specific layer loses sync with the filesystem,
* it should call this to invalidate cached data and abort waiting
* threads.
*/
void fsmonitor_force_resync(struct fsmonitor_daemon_state *state);
#endif /* HAVE_FSMONITOR_DAEMON_BACKEND */
#endif /* FSMONITOR_DAEMON_H */