From b227586831ed393e1d60629bfedcef01be4b9c22 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Martin=20=C3=85gren?= Date: Wed, 9 May 2018 22:55:38 +0200 Subject: lock_file: make function-local locks non-static MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Placing `struct lock_file`s on the stack used to be a bad idea, because the temp- and lockfile-machinery would keep a pointer into the struct. But after 076aa2cbd (tempfile: auto-allocate tempfiles on heap, 2017-09-05), we can safely have lockfiles on the stack. (This applies even if a user returns early, leaving a locked lock behind.) These `struct lock_file`s are local to their respective functions and we can drop their staticness. For good measure, I have inspected these sites and come to believe that they always release the lock, with the possible exception of bailing out using `die()` or `exit()` or by returning from a `cmd_foo()`. As pointed out by Jeff King, it would be bad if someone held on to a `struct lock_file *` for some reason. After some grepping, I agree with his findings: no-one appears to be doing that. Signed-off-by: Martin Ågren Signed-off-by: Junio C Hamano diff --git a/apply.c b/apply.c index 134dc7b..3d43212 100644 --- a/apply.c +++ b/apply.c @@ -4058,7 +4058,7 @@ static int build_fake_ancestor(struct apply_state *state, struct patch *list) { struct patch *patch; struct index_state result = { NULL }; - static struct lock_file lock; + struct lock_file lock = LOCK_INIT; int res; /* Once we start supporting the reverse patch, it may be diff --git a/builtin/describe.c b/builtin/describe.c index e4869df..8933aa9 100644 --- a/builtin/describe.c +++ b/builtin/describe.c @@ -612,7 +612,7 @@ int cmd_describe(int argc, const char **argv, const char *prefix) suffix = broken; } } else if (dirty) { - static struct lock_file index_lock; + struct lock_file index_lock = LOCK_INIT; struct rev_info revs; struct argv_array args = ARGV_ARRAY_INIT; int fd, result; diff --git a/builtin/difftool.c b/builtin/difftool.c index bcc79d1..d9a0fec 100644 --- a/builtin/difftool.c +++ b/builtin/difftool.c @@ -610,7 +610,7 @@ static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix, continue; if (!indices_loaded) { - static struct lock_file lock; + struct lock_file lock = LOCK_INIT; strbuf_reset(&buf); strbuf_addf(&buf, "%s/wtindex", tmpdir); if (hold_lock_file_for_update(&lock, buf.buf, 0) < 0 || diff --git a/builtin/gc.c b/builtin/gc.c index f51e5a6..9b6463d 100644 --- a/builtin/gc.c +++ b/builtin/gc.c @@ -233,7 +233,7 @@ static int need_to_gc(void) /* return NULL on success, else hostname running the gc */ static const char *lock_repo_for_gc(int force, pid_t* ret_pid) { - static struct lock_file lock; + struct lock_file lock = LOCK_INIT; char my_host[HOST_NAME_MAX + 1]; struct strbuf sb = STRBUF_INIT; struct stat st; diff --git a/builtin/merge.c b/builtin/merge.c index ee050a4..5be978f 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -647,7 +647,7 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common, struct commit_list *remoteheads, struct commit *head) { - static struct lock_file lock; + struct lock_file lock = LOCK_INIT; const char *head_arg = "HEAD"; hold_locked_index(&lock, LOCK_DIE_ON_ERROR); @@ -805,7 +805,7 @@ static int merge_trivial(struct commit *head, struct commit_list *remoteheads) { struct object_id result_tree, result_commit; struct commit_list *parents, **pptr = &parents; - static struct lock_file lock; + struct lock_file lock = LOCK_INIT; hold_locked_index(&lock, LOCK_DIE_ON_ERROR); refresh_cache(REFRESH_QUIET); diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c index 75e7f18..0c074b0 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -875,7 +875,7 @@ static void refuse_unconfigured_deny_delete_current(void) static int command_singleton_iterator(void *cb_data, struct object_id *oid); static int update_shallow_ref(struct command *cmd, struct shallow_info *si) { - static struct lock_file shallow_lock; + struct lock_file shallow_lock = LOCK_INIT; struct oid_array extra = OID_ARRAY_INIT; struct check_connected_options opt = CHECK_CONNECTED_INIT; uint32_t mask = 1 << (cmd->index % 32); diff --git a/bundle.c b/bundle.c index efe547e..4fde31d 100644 --- a/bundle.c +++ b/bundle.c @@ -409,7 +409,7 @@ static int write_bundle_refs(int bundle_fd, struct rev_info *revs) int create_bundle(struct bundle_header *header, const char *path, int argc, const char **argv) { - static struct lock_file lock; + struct lock_file lock = LOCK_INIT; int bundle_fd = -1; int bundle_to_stdout; int ref_count = 0; diff --git a/fast-import.c b/fast-import.c index b5db5d2..2bce22a 100644 --- a/fast-import.c +++ b/fast-import.c @@ -1858,7 +1858,7 @@ static void dump_marks_helper(FILE *f, static void dump_marks(void) { - static struct lock_file mark_lock; + struct lock_file mark_lock = LOCK_INIT; FILE *f; if (!export_marks_file || (import_marks_file && !import_marks_file_done)) diff --git a/refs/files-backend.c b/refs/files-backend.c index bec8e30..197eea4 100644 --- a/refs/files-backend.c +++ b/refs/files-backend.c @@ -2989,7 +2989,7 @@ static int files_reflog_expire(struct ref_store *ref_store, { struct files_ref_store *refs = files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); - static struct lock_file reflog_lock; + struct lock_file reflog_lock = LOCK_INIT; struct expire_reflog_cb cb; struct ref_lock *lock; struct strbuf log_file_sb = STRBUF_INIT; diff --git a/shallow.c b/shallow.c index df4d44e..8531361 100644 --- a/shallow.c +++ b/shallow.c @@ -353,7 +353,7 @@ void advertise_shallow_grafts(int fd) */ void prune_shallow(int show_only) { - static struct lock_file shallow_lock; + struct lock_file shallow_lock = LOCK_INIT; struct strbuf sb = STRBUF_INIT; int fd; -- cgit v0.10.2-6-g49f6