- Removed one copy of an uncompressed block contents changing
the signature of Snappy_Uncompress() so it uncompresses into a
flat array instead of a std::string.
Speeds up readrandom ~10%.
- Instead of a combination of Env/WritableFile, we now have a
Logger interface that can be easily overridden applications
that want to supply their own logging.
- Separated out the gcc and Sun Studio parts of atomic_pointer.h
so we can use 'asm', 'volatile' keywords for Sun Studio.
git-svn-id: https://leveldb.googlecode.com/svn/trunk@39 62dab493-f737-651d-591e-8d6aee1b9529
main
gabor@google.com
14 years ago
parent
6872ace901
commit
60bd8015f2
@ -0,0 +1,97 @@ |
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// Copyright 2011 Google Inc. All Rights Reserved.
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// Author: sanjay@google.com (Sanjay Ghemawat)
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//
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// Logger implementation that can be shared by all environments
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// where enough posix functionality is available.
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#ifndef STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_ |
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#define STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_ |
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#include <algorithm> |
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#include <stdio.h> |
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#include <sys/time.h> |
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#include <time.h> |
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#include "leveldb/env.h" |
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namespace leveldb { |
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class PosixLogger : public Logger { |
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private: |
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FILE* file_; |
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uint64_t (*gettid_)(); // Return the thread id for the current thread
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public: |
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PosixLogger(FILE* f, uint64_t (*gettid)()) : file_(f), gettid_(gettid) { } |
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virtual ~PosixLogger() { |
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fclose(file_); |
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} |
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virtual void Logv(const char* format, va_list ap) { |
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const uint64_t thread_id = (*gettid_)(); |
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// We try twice: the first time with a fixed-size stack allocated buffer,
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// and the second time with a much larger dynamically allocated buffer.
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char buffer[500]; |
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for (int iter = 0; iter < 2; iter++) { |
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char* base; |
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int bufsize; |
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if (iter == 0) { |
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bufsize = sizeof(buffer); |
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base = buffer; |
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} else { |
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bufsize = 30000; |
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base = new char[bufsize]; |
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} |
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char* p = base; |
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char* limit = base + bufsize; |
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struct timeval now_tv; |
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gettimeofday(&now_tv, NULL); |
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const time_t seconds = now_tv.tv_sec; |
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struct tm t; |
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localtime_r(&seconds, &t); |
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p += snprintf(p, limit - p, |
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"%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ", |
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t.tm_year + 1900, |
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t.tm_mon + 1, |
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t.tm_mday, |
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t.tm_hour, |
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t.tm_min, |
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t.tm_sec, |
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static_cast<int>(now_tv.tv_usec), |
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static_cast<long long unsigned int>(thread_id)); |
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// Print the message
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if (p < limit) { |
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va_list backup_ap; |
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va_copy(backup_ap, ap); |
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p += vsnprintf(p, limit - p, format, backup_ap); |
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va_end(backup_ap); |
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} |
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// Truncate to available space if necessary
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if (p >= limit) { |
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if (iter == 0) { |
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continue; // Try again with larger buffer
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} else { |
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p = limit - 1; |
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} |
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} |
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// Add newline if necessary
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if (p == base || p[-1] != '\n') { |
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*p++ = '\n'; |
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} |
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assert(p <= limit); |
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fwrite(base, 1, p - base, file_); |
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fflush(file_); |
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if (base != buffer) { |
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delete[] base; |
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} |
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break; |
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} |
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} |
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}; |
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} |
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#endif // STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_
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