Make the MSVC projects use PDB/IDB files named after the project
[git/dscho.git] / preload-index.c
blob92899333c2d8edbed71fdd3a43e19f25a10e5b03
1 /*
2 * Copyright (C) 2008 Linus Torvalds
3 */
4 #include "cache.h"
6 #ifdef NO_PTHREADS
7 static void preload_index(struct index_state *index, const char **pathspec)
9 ; /* nothing */
11 #else
13 #include <pthread.h>
16 * Mostly randomly chosen maximum thread counts: we
17 * cap the parallelism to 20 threads, and we want
18 * to have at least 500 lstat's per thread for it to
19 * be worth starting a thread.
21 #define MAX_PARALLEL (20)
22 #define THREAD_COST (500)
24 struct thread_data {
25 pthread_t pthread;
26 struct index_state *index;
27 const char **pathspec;
28 int offset, nr;
31 static void *preload_thread(void *_data)
33 int nr;
34 struct thread_data *p = _data;
35 struct index_state *index = p->index;
36 struct cache_entry **cep = index->cache + p->offset;
37 struct cache_def cache;
39 memset(&cache, 0, sizeof(cache));
40 nr = p->nr;
41 if (nr + p->offset > index->cache_nr)
42 nr = index->cache_nr - p->offset;
44 do {
45 struct cache_entry *ce = *cep++;
46 struct stat st;
48 if (ce_stage(ce))
49 continue;
50 if (ce_uptodate(ce))
51 continue;
52 if (!ce_path_match(ce, p->pathspec))
53 continue;
54 if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce)))
55 continue;
56 if (lstat(ce->name, &st))
57 continue;
58 if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY))
59 continue;
60 ce_mark_uptodate(ce);
61 } while (--nr > 0);
62 return NULL;
65 static void preload_index(struct index_state *index, const char **pathspec)
67 int threads, i, work, offset;
68 struct thread_data data[MAX_PARALLEL];
70 if (!core_preload_index)
71 return;
73 threads = index->cache_nr / THREAD_COST;
74 if (threads < 2)
75 return;
76 if (threads > MAX_PARALLEL)
77 threads = MAX_PARALLEL;
78 offset = 0;
79 work = DIV_ROUND_UP(index->cache_nr, threads);
80 for (i = 0; i < threads; i++) {
81 struct thread_data *p = data+i;
82 p->index = index;
83 p->pathspec = pathspec;
84 p->offset = offset;
85 p->nr = work;
86 offset += work;
87 if (pthread_create(&p->pthread, NULL, preload_thread, p))
88 die("unable to create threaded lstat");
90 for (i = 0; i < threads; i++) {
91 struct thread_data *p = data+i;
92 if (pthread_join(p->pthread, NULL))
93 die("unable to join threaded lstat");
96 #endif
98 int read_index_preload(struct index_state *index, const char **pathspec)
100 int retval = read_index(index);
102 preload_index(index, pathspec);
103 return retval;