Fix potential ambiguities in/around port/sys_time.h (#10045)

Summary:
There are some time-related POSIX APIs that are not available on Windows
(e.g. `localtime_r`), which we have worked around by providing our own
implementations in `port/sys_time.h`. This workaround actually relies on
some ambiguity: on Windows, a call to `localtime_r` calls
`ROCKSDB_NAMESPACE::port::localtime_r` (which is pulled into
`ROCKSDB_NAMESPACE` by a using-declaration), while on other platforms
it calls the global `localtime_r`. This works fine as long as there is only one
candidate function; however, it breaks down when there is more than one
`localtime_r` visible in a scope.

The patch fixes this by introducing `ROCKSDB_NAMESPACE::port::{TimeVal, GetTimeOfDay, LocalTimeR}`
to eliminate any ambiguity.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10045

Test Plan: `make check`

Reviewed By: riversand963

Differential Revision: D36639372

Pulled By: ltamasi

fbshipit-source-id: fc13dbfa421b7c8918111a6d9e24ce77e91a7c50

env/env_posix.cc

@@ -134,8 +134,8 @@ class PosixClock : public SystemClock {
   const char* NickName() const override { return kClassName(); }
 
   uint64_t NowMicros() override {
-    struct timeval tv;
-    gettimeofday(&tv, nullptr);
+    port::TimeVal tv;
+    port::GetTimeOfDay(&tv, nullptr);
     return static_cast<uint64_t>(tv.tv_sec) * 1000000 + tv.tv_usec;
   }
 
@@ -200,7 +200,7 @@ class PosixClock : public SystemClock {
     dummy.reserve(maxsize);
     dummy.resize(maxsize);
     char* p = &dummy[0];
-    localtime_r(&seconds, &t);
+    port::LocalTimeR(&seconds, &t);
     snprintf(p, maxsize, "%04d/%02d/%02d-%02d:%02d:%02d ", t.tm_year + 1900,
              t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec);
     return dummy;

env/env_test.cc

@@ -1604,9 +1604,9 @@ class TestLogger : public Logger {
 
       if (new_format[0] == '[') {
         // "[DEBUG] "
-        ASSERT_TRUE(n <= 56 + (512 - static_cast<int>(sizeof(struct timeval))));
+        ASSERT_TRUE(n <= 56 + (512 - static_cast<int>(sizeof(port::TimeVal))));
       } else {
-        ASSERT_TRUE(n <= 48 + (512 - static_cast<int>(sizeof(struct timeval))));
+        ASSERT_TRUE(n <= 48 + (512 - static_cast<int>(sizeof(port::TimeVal))));
       }
       va_end(backup_ap);
     }
@@ -1674,9 +1674,9 @@ class TestLogger2 : public Logger {
       va_copy(backup_ap, ap);
       int n = vsnprintf(new_format, sizeof(new_format) - 1, format, backup_ap);
       // 48 bytes for extra information + bytes allocated
-      ASSERT_TRUE(
-          n <= 48 + static_cast<int>(max_log_size_ - sizeof(struct timeval)));
-      ASSERT_TRUE(n > static_cast<int>(max_log_size_ - sizeof(struct timeval)));
+      ASSERT_TRUE(n <=
+                  48 + static_cast<int>(max_log_size_ - sizeof(port::TimeVal)));
+      ASSERT_TRUE(n > static_cast<int>(max_log_size_ - sizeof(port::TimeVal)));
       va_end(backup_ap);
     }
   }

env/mock_env.cc

@@ -509,13 +509,13 @@ class TestMemLogger : public Logger {
       char* p = base;
       char* limit = base + bufsize;
 
-      struct timeval now_tv;
-      gettimeofday(&now_tv, nullptr);
+      port::TimeVal now_tv;
+      port::GetTimeOfDay(&now_tv, nullptr);
       const time_t seconds = now_tv.tv_sec;
       struct tm t;
       memset(&t, 0, sizeof(t));
       struct tm* ret __attribute__((__unused__));
-      ret = localtime_r(&seconds, &t);
+      ret = port::LocalTimeR(&seconds, &t);
       assert(ret);
       p += snprintf(p, limit - p, "%04d/%02d/%02d-%02d:%02d:%02d.%06d ",
                     t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour,

logging/env_logger.h

@@ -100,11 +100,11 @@ class EnvLogger : public Logger {
       char* p = base;
       char* limit = base + bufsize;
 
-      struct timeval now_tv;
-      gettimeofday(&now_tv, nullptr);
+      port::TimeVal now_tv;
+      port::GetTimeOfDay(&now_tv, nullptr);
       const time_t seconds = now_tv.tv_sec;
       struct tm t;
-      localtime_r(&seconds, &t);
+      port::LocalTimeR(&seconds, &t);
       p += snprintf(p, limit - p, "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ",
                     t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour,
                     t.tm_min, t.tm_sec, static_cast<int>(now_tv.tv_usec),

logging/log_buffer.cc

@@ -27,7 +27,7 @@ void LogBuffer::AddLogToBuffer(size_t max_log_size, const char* format,
   char* limit = alloc_mem + max_log_size - 1;
 
   // store the time
-  gettimeofday(&(buffered_log->now_tv), nullptr);
+  port::GetTimeOfDay(&(buffered_log->now_tv), nullptr);
 
   // Print the message
   if (p < limit) {
@@ -60,7 +60,7 @@ void LogBuffer::FlushBufferToLog() {
   for (BufferedLog* log : logs_) {
     const time_t seconds = log->now_tv.tv_sec;
     struct tm t;
-    if (localtime_r(&seconds, &t) != nullptr) {
+    if (port::LocalTimeR(&seconds, &t) != nullptr) {
       Log(log_level_, info_log_,
           "(Original Log Time %04d/%02d/%02d-%02d:%02d:%02d.%06d) %s",
           t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min,

logging/log_buffer.h

@@ -35,7 +35,7 @@ class LogBuffer {
  private:
   // One log entry with its timestamp
   struct BufferedLog {
-    struct timeval now_tv;  // Timestamp of the log
+    port::TimeVal now_tv;   // Timestamp of the log
     char message[1];        // Beginning of log message
   };
 

logging/posix_logger.h

@@ -103,11 +103,11 @@ class PosixLogger : public Logger {
       char* p = base;
       char* limit = base + bufsize;
 
-      struct timeval now_tv;
-      gettimeofday(&now_tv, nullptr);
+      port::TimeVal now_tv;
+      port::GetTimeOfDay(&now_tv, nullptr);
       const time_t seconds = now_tv.tv_sec;
       struct tm t;
-      localtime_r(&seconds, &t);
+      port::LocalTimeR(&seconds, &t);
       p += snprintf(p, limit - p, "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llu ",
                     t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour,
                     t.tm_min, t.tm_sec, static_cast<int>(now_tv.tv_usec),

port/sys_time.h

@@ -12,36 +12,52 @@
 
 #pragma once
 
-#if defined(OS_WIN) && defined(_MSC_VER)
+#include "rocksdb/rocksdb_namespace.h"
 
-#include <time.h>
+#if defined(OS_WIN) && (defined(_MSC_VER) || defined(__MINGW32__))
 
-#include "rocksdb/rocksdb_namespace.h"
+#include <time.h>
 
 namespace ROCKSDB_NAMESPACE {
 
 namespace port {
 
-// Avoid including winsock2.h for this definition
-struct timeval {
+struct TimeVal {
   long tv_sec;
   long tv_usec;
 };
 
-void gettimeofday(struct timeval* tv, struct timezone* tz);
+void GetTimeOfDay(TimeVal* tv, struct timezone* tz);
 
-inline struct tm* localtime_r(const time_t* timep, struct tm* result) {
+inline struct tm* LocalTimeR(const time_t* timep, struct tm* result) {
   errno_t ret = localtime_s(result, timep);
   return (ret == 0) ? result : NULL;
 }
-}
 
-using port::timeval;
-using port::gettimeofday;
-using port::localtime_r;
+}  // namespace port
+
 }  // namespace ROCKSDB_NAMESPACE
 
 #else
 #include <time.h>
 #include <sys/time.h>
+
+namespace ROCKSDB_NAMESPACE {
+
+namespace port {
+
+using TimeVal = struct timeval;
+
+inline void GetTimeOfDay(TimeVal* tv, struct timezone* tz) {
+  gettimeofday(tv, tz);
+}
+
+inline struct tm* LocalTimeR(const time_t* timep, struct tm* result) {
+  return localtime_r(timep, result);
+}
+
+}  // namespace port
+
+}  // namespace ROCKSDB_NAMESPACE
+
 #endif

port/win/port_win.cc

@@ -52,7 +52,7 @@ std::wstring utf8_to_utf16(const std::string& utf8) {
 }
 #endif
 
-void gettimeofday(struct timeval* tv, struct timezone* /* tz */) {
+void GetTimeOfDay(TimeVal* tv, struct timezone* /* tz */) {
   std::chrono::microseconds usNow(
       std::chrono::duration_cast<std::chrono::microseconds>(
           std::chrono::system_clock::now().time_since_epoch()));

port/win/win_logger.cc

@@ -118,8 +118,8 @@ void WinLogger::Logv(const char* format, va_list ap) {
     char* p = base;
     char* limit = base + bufsize;
 
-    struct timeval now_tv;
-    gettimeofday(&now_tv, nullptr);
+    port::TimeVal now_tv;
+    port::GetTimeOfDay(&now_tv, nullptr);
     const time_t seconds = now_tv.tv_sec;
     struct tm t;
     localtime_s(&t, &seconds);

util/string_util.cc

@@ -150,7 +150,7 @@ std::string TimeToHumanString(int unixtime) {
   char time_buffer[80];
   time_t rawtime = unixtime;
   struct tm tInfo;
-  struct tm* timeinfo = localtime_r(&rawtime, &tInfo);
+  struct tm* timeinfo = port::LocalTimeR(&rawtime, &tInfo);
   assert(timeinfo == &tInfo);
   strftime(time_buffer, 80, "%c", timeinfo);
   return std::string(time_buffer);

utilities/persistent_cache/hash_table_bench.cc

@@ -11,14 +11,16 @@
 int main() { fprintf(stderr, "Please install gflags to run tools\n"); }
 #else
 
+#include <sys/time.h>
+#include <unistd.h>
+
 #include <atomic>
 #include <functional>
 #include <string>
 #include <unordered_map>
-#include <unistd.h>
-#include <sys/time.h>
 
 #include "port/port_posix.h"
+#include "port/sys_time.h"
 #include "rocksdb/env.h"
 #include "util/gflags_compat.h"
 #include "util/mutexlock.h"
@@ -152,8 +154,8 @@ class HashTableBenchmark {
   }
 
   static uint64_t NowInMillSec() {
-    timeval tv;
-    gettimeofday(&tv, /*tz=*/nullptr);
+    port::TimeVal tv;
+    port::GetTimeOfDay(&tv, /*tz=*/nullptr);
     return tv.tv_sec * 1000 + tv.tv_usec / 1000;
   }