diff options
Diffstat (limited to 'mysys/my_likely.c')
| -rw-r--r-- | mysys/my_likely.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/mysys/my_likely.c b/mysys/my_likely.c new file mode 100644 index 00000000..2ae587be --- /dev/null +++ b/mysys/my_likely.c @@ -0,0 +1,172 @@ +/* Copyright (c) 2018, MariaDB Corporation Ab. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ + +/* + Checks that my_likely/my_unlikely is correctly used + + Note that we can't use mysql_mutex or my_malloc here as these + uses likely() macros and the likely_mutex would be used twice +*/ + +#include "mysys_priv.h" +#include <hash.h> +#include <m_ctype.h> + +#ifndef CHECK_UNLIKEY +my_bool likely_inited= 0; + +typedef struct st_likely_entry +{ + const char *key; + size_t key_length; + uint line; + ulonglong ok,fail; +} LIKELY_ENTRY; + +static uchar *get_likely_key(LIKELY_ENTRY *part, size_t *length, + my_bool not_used __attribute__((unused))) +{ + *length= part->key_length; + return (uchar*) part->key; +} + +pthread_mutex_t likely_mutex; +HASH likely_hash; + +void init_my_likely() +{ + /* Allocate big enough to avoid malloc calls */ + my_hash_init2(PSI_NOT_INSTRUMENTED, &likely_hash, 10000, &my_charset_bin, + 1024, 0, 0, (my_hash_get_key) get_likely_key, 0, free, + HASH_UNIQUE); + likely_inited= 1; + pthread_mutex_init(&likely_mutex, MY_MUTEX_INIT_FAST); +} + +static int likely_cmp(LIKELY_ENTRY **a, LIKELY_ENTRY **b) +{ + int cmp; + if ((cmp= strcmp((*a)->key, (*b)->key))) + return cmp; + return (int) ((*a)->line - (*b)->line); +} + + +void end_my_likely(FILE *out) +{ + uint i; + FILE *likely_file; + my_bool do_close= 0; + LIKELY_ENTRY **sort_ptr= 0; + + likely_inited= 0; + + if (!(likely_file= out)) + { + char name[80]; + sprintf(name, "/tmp/unlikely-%lu.out", (ulong) getpid()); + if ((likely_file= my_fopen(name, O_TRUNC | O_WRONLY, MYF(MY_WME)))) + do_close= 1; + else + likely_file= stderr; + } + fflush(likely_file); + fputs("Wrong likely/unlikely usage:\n", likely_file); + if (!(sort_ptr= (LIKELY_ENTRY**) + malloc(sizeof(LIKELY_ENTRY*) *likely_hash.records))) + { + fprintf(stderr, "ERROR: Out of memory in end_my_likely\n"); + goto err; + } + + for (i=0 ; i < likely_hash.records ; i++) + sort_ptr[i]= (LIKELY_ENTRY *) my_hash_element(&likely_hash, i); + + my_qsort(sort_ptr, likely_hash.records, sizeof(LIKELY_ENTRY*), + (qsort_cmp) likely_cmp); + + for (i=0 ; i < likely_hash.records ; i++) + { + LIKELY_ENTRY *entry= sort_ptr[i]; + if (entry->fail > entry->ok) + fprintf(likely_file, + "%50s line: %6u ok: %8lld fail: %8lld\n", + entry->key, entry->line, entry->ok, entry->fail); + } + fputs("\n", likely_file); + fflush(likely_file); +err: + free((void*) sort_ptr); + if (do_close) + my_fclose(likely_file, MYF(MY_WME)); + pthread_mutex_destroy(&likely_mutex); + my_hash_free(&likely_hash); +} + + +static LIKELY_ENTRY *my_likely_find(const char *file_name, uint line) +{ + char key[80], *pos; + LIKELY_ENTRY *entry; + size_t length; + + if (!likely_inited) + return 0; + + pos= strnmov(key, file_name, sizeof(key)-4); + int3store(pos+1, line); + length= (size_t) (pos-key)+4; + + pthread_mutex_lock(&likely_mutex); + if (!(entry= (LIKELY_ENTRY*) my_hash_search(&likely_hash, (uchar*) key, + length))) + { + if (!(entry= (LIKELY_ENTRY *) malloc(sizeof(*entry) + length))) + return 0; + entry->key= (char*) (entry+1); + memcpy((void*) entry->key, key, length); + entry->key_length= length; + entry->line= line; + entry->ok= entry->fail= 0; + + if (my_hash_insert(&likely_hash, (void*) entry)) + { + pthread_mutex_unlock(&likely_mutex); + free(entry); + return 0; + } + } + pthread_mutex_unlock(&likely_mutex); + return entry; +} + + +int my_likely_ok(const char *file_name, uint line) +{ + LIKELY_ENTRY *entry= my_likely_find(file_name, line); + if (entry) + entry->ok++; + return 0; +} + + +int my_likely_fail(const char *file_name, uint line) +{ + LIKELY_ENTRY *entry= my_likely_find(file_name, line); + if (entry) + entry->fail++; + return 0; +} +#endif /* CHECK_UNLIKEY */ |