stellar support monotonic time and real time

include/stellar/session.h

@@ -113,6 +113,7 @@ enum session_stat
     MAX_STAT,
 };
 
+// realtime in seconds
 enum session_timestamp
 {
     SESSION_TIMESTAMP_START,

src/CMakeLists.txt

@@ -1,5 +1,5 @@
 add_subdirectory(log)
-add_subdirectory(timestamp)
+add_subdirectory(times)
 add_subdirectory(tuple)
 add_subdirectory(packet)
 add_subdirectory(packet_io)

src/id_generator/id_generator.cpp

@@ -2,6 +2,7 @@
 #include <string.h>
 
 #include "macro.h"
+#include "times.h"
 #include "stellar_priv.h"
 #include "id_generator.h"
 
@@ -62,13 +63,11 @@ uint64_t id_generator_alloc()
 #define MAX_ID_PER_THREAD (32768)
 #define MAX_ID_BASE_TIME (268435456L)
 
-    struct timespec ts;
-    clock_gettime(CLOCK_REALTIME, &ts); // must be realtime
     uint64_t thr_idx = stellar_get_current_thread_index();
 
     uint64_t global_id = 0;
     uint64_t id_per_thread = (global_id_generator.thread_volatile[thr_idx]++) % MAX_ID_PER_THREAD;
-    uint64_t id_base_time = ts.tv_sec % MAX_ID_BASE_TIME;
+    uint64_t id_base_time = stellar_get_real_time_sec() % MAX_ID_BASE_TIME;
     global_id = (global_id_generator.device_id << 51) |
                 (thr_idx << 43) |
                 (id_base_time << 15) |

src/session/session_manager.cpp

@@ -3,6 +3,7 @@
 #include <assert.h>
 
 #include "macro.h"
+#include "times.h"
 #include "tcp_utils.h"
 #include "udp_utils.h"
 #include "id_generator.h"
@@ -513,9 +514,7 @@ static int duplicated_packet_bypass(struct session_manager *mgr, struct session
 
 static void session_update(struct session *sess, enum session_state next_state, const struct packet *pkt, const struct tuple6 *key, enum flow_direction dir)
 {
-     struct timespec real;
+     uint64_t real_sec = stellar_get_real_time_sec();
-     clock_gettime(CLOCK_REALTIME, &real); // must be realtime
-
      if (session_get_state(sess) == SESSION_STATE_INIT)
      {
           session_set_id(sess, id_generator_alloc());
@@ -548,7 +547,7 @@ static void session_update(struct session *sess, enum session_state next_state,
           }
 
           tuple6_to_str(key, sess->tuple_str, sizeof(sess->tuple_str));
-          session_set_timestamp(sess, SESSION_TIMESTAMP_START, real.tv_sec);
+          session_set_timestamp(sess, SESSION_TIMESTAMP_START, real_sec);
           switch (key->ip_proto)
           {
           case IPPROTO_TCP:
@@ -580,7 +579,7 @@ static void session_update(struct session *sess, enum session_state next_state,
 
      session_set_current_packet(sess, pkt);
      session_set_flow_direction(sess, dir);
-     session_set_timestamp(sess, SESSION_TIMESTAMP_LAST, real.tv_sec);
+     session_set_timestamp(sess, SESSION_TIMESTAMP_LAST, real_sec);
      session_set_state(sess, next_state);
 }
 

src/session/session_priv.h

@@ -46,7 +46,7 @@ struct session
 {
     uint64_t id;
     uint64_t stats[MAX_FLOW_DIRECTION][MAX_STAT];
-    uint64_t timestamps[MAX_TIMESTAMP];
+    uint64_t timestamps[MAX_TIMESTAMP]; // realtime seconds
     struct tcp_half tcp_halfs[MAX_FLOW_DIRECTION];
     struct timeout timeout;
     struct list_head lru;

src/session/test/gtest_case_tcp_fast_open.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -302,6 +303,7 @@ TEST(CASE, TCP_FAST_OPEN)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_state_tcp_active_to_closing.cpp

@@ -1,6 +1,7 @@
 // TCP state machine test: active -> closing
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -86,6 +87,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_FIN_FIN)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -176,6 +178,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_C2S_RST)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -262,6 +265,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_S2C_RST)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -346,6 +350,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_DATA_TIMEOUT)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -395,6 +400,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_C2S_HALF_CLOSED_TIMEOUT)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -474,6 +480,7 @@ TEST(TCP_ACTIVE_TO_CLOSING, BY_S2C_HALF_CLOSED_TIMEOUT)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_state_tcp_init_to_opening.cpp

@@ -1,6 +1,7 @@
 // TCP state machine test: init -> opening
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -59,6 +60,7 @@ TEST(TCP_INIT_TO_OPENING, BY_SYN)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -136,6 +138,7 @@ TEST(TCP_INIT_TO_OPENING, BY_SYNACK)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -213,6 +216,7 @@ TEST(TCP_INIT_TO_OPENING, BY_SYN_SYNACK)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -301,6 +305,7 @@ TEST(TCP_INIT_TO_OPENING, BY_SYN_SYNACK_ACK)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -402,6 +407,7 @@ TEST(TCP_INIT_TO_OPENING, BY_SYN_RETRANSMISSION)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -497,6 +503,7 @@ TEST(TCP_INIT_TO_OPENING, BY_SYNACK_RETRANSMISSION)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -591,6 +598,7 @@ TEST(TCP_INIT_TO_OPENING, BY_C2S_ASMMETRIC)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -679,6 +687,7 @@ TEST(TCP_INIT_TO_OPENING, BY_S2C_ASMMETRIC)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp

@@ -1,6 +1,7 @@
 // TCP state machine test: init -> opening -> active -> closing -> closed
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -54,6 +55,7 @@ TEST(TCP_INIT_TO_OPENING_TO_ACTIVE_TO_CLOSING_TO_CLOSED, TEST)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_state_tcp_opening_to_active.cpp

@@ -1,6 +1,7 @@
 // TCP state machine test: opening -> active
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -58,6 +59,7 @@ TEST(TCP_OPENING_TO_ACTIVE, BY_SYN_C2S_DATA)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -146,6 +148,7 @@ TEST(TCP_OPENING_TO_ACTIVE, BY_SYNACK_S2C_DATA)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_state_tcp_opening_to_closing.cpp

@@ -1,6 +1,7 @@
 // TCP state machine test: opening -> closing
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -59,6 +60,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_FIN_FIN)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -157,6 +159,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_C2S_RST)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -251,6 +254,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_S2C_RST)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -344,6 +348,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_INIT_TIMEOUT)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -401,6 +406,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_HANDSHAKE_TIMEOUT)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -489,6 +495,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_DATA_TIMEOUT)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -588,6 +595,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_C2S_HALF_FIN)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -675,6 +683,7 @@ TEST(TCP_OPENING_TO_CLOSING, BY_S2C_HALF_FIN)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp

@@ -1,6 +1,7 @@
 // UDP state machine test: init -> opening -> active -> closing
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -54,6 +55,7 @@ TEST(UDP_INIT_TO_OPENING_TO_ACTIVE_TO_CLOSING, TEST)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp

@@ -1,6 +1,7 @@
 // UDP state machine test: init -> opening -> closing
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -59,6 +60,7 @@ TEST(UDP_INIT_TO_OPENING_TO_CLOSING, BY_C2S)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -137,6 +139,7 @@ TEST(UDP_INIT_TO_OPENING_TO_CLOSING, BY_S2C)
     struct session_manager *mgr = NULL;
     struct session_manager_stat *stat = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_timeout_tcp_data.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -51,6 +52,7 @@ TEST(TIMEOUT, TCP_TIMEOUT_DATA)
     struct session *sess = NULL;
     struct session_manager *mgr = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_timeout_tcp_handshake.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -52,6 +53,7 @@ TEST(TIMEOUT, TCP_TIMEOUT_HANDSHAKE)
     struct session *sess = NULL;
     struct session_manager *mgr = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_timeout_tcp_init.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -52,6 +53,7 @@ TEST(TIMEOUT, TCP_TIMEOUT_INIT)
     struct session *sess = NULL;
     struct session_manager *mgr = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/session/test/gtest_timeout_udp_data.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "times.h"
 #include "session_priv.h"
 #include "session_manager.h"
 
@@ -51,6 +52,7 @@ TEST(TIMEOUT, UDP_TIMEOUT_DATA1)
     struct session *sess = NULL;
     struct session_manager *mgr = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 
@@ -86,6 +88,7 @@ TEST(TIMEOUT, UDP_TIMEOUT_DATA2)
     struct session *sess = NULL;
     struct session_manager *mgr = NULL;
 
+    stellar_update_time_cache();
     mgr = session_manager_new(&opts, 1);
     EXPECT_TRUE(mgr != NULL);
 

src/stellar/CMakeLists.txt

@@ -1,5 +1,5 @@
 add_library(core config.cpp stat.cpp stellar.cpp inject.cpp)
-target_link_libraries(core timestamp plugin_manager session_manager ip_reassembly packet_io pthread fieldstat4 toml)
+target_link_libraries(core times plugin_manager session_manager ip_reassembly packet_io pthread fieldstat4 toml)
 
 add_executable(stellar main.cpp)
 target_link_libraries(stellar core plugin_manager)

src/stellar/main.cpp

@@ -7,8 +7,8 @@
 #include <stdlib.h>
 
 #include "logo.h"
+#include "times.h"
 #include "config.h"
-#include "timestamp.h"
 #include "id_generator.h"
 #include "stellar_priv.h"
 
@@ -65,7 +65,7 @@ static int all_session_have_freed(void)
 
 int main(int argc, char **argv)
 {
-    timestamp_update();
+    stellar_update_time_cache();
 
     signal(SIGINT, signal_handler);
     signal(SIGQUIT, signal_handler);
@@ -126,13 +126,13 @@ int main(int argc, char **argv)
         goto error_out;
     }
 
-    runtime->stat_last_output_ts = timestamp_get_msec();
+    runtime->stat_last_output_ts = stellar_get_monotonic_time_msec();
     while (!ATOMIC_READ(&runtime->need_exit))
     {
-        timestamp_update();
+        stellar_update_time_cache();
-        if (timestamp_get_msec() - runtime->stat_last_output_ts > 2000)
+        if (stellar_get_monotonic_time_msec() - runtime->stat_last_output_ts > 2000)
         {
-            runtime->stat_last_output_ts = timestamp_get_msec();
+            runtime->stat_last_output_ts = stellar_get_monotonic_time_msec();
             stellar_stat_output(runtime->stat);
         }
         usleep(1000); // 1ms

src/stellar/stellar.cpp

@@ -4,8 +4,8 @@
 #include <pthread.h>
 #include <sys/prctl.h>
 
+#include "times.h"
 #include "config.h"
-#include "timestamp.h"
 #include "stellar_priv.h"
 
 struct stellar_runtime __runtime = {0};
@@ -122,7 +122,7 @@ static void *work_thread(void *arg)
 
     while (ATOMIC_READ(&runtime->need_exit) == 0)
     {
-        now = timestamp_get_msec();
+        now = stellar_get_monotonic_time_msec();
         memset(packets, 0, sizeof(packets));
         nr_recv = packet_io_ingress(packet_io, thr_idx, packets, RX_BURST_MAX);
         if (nr_recv == 0)
@@ -247,7 +247,7 @@ void stellar_set_current_thread_index(uint16_t idx)
 
 int stellar_thread_init(struct stellar_runtime *runtime, struct stellar_config *config)
 {
-    uint64_t now = timestamp_get_msec();
+    uint64_t now = stellar_get_monotonic_time_msec();
     for (uint16_t i = 0; i < config->io_opts.nr_threads; i++)
     {
         struct stellar_thread *thread = &runtime->threads[i];

src/times/CMakeLists.txt

@@ -0,0 +1,6 @@
+add_library(times times.cpp)
+target_include_directories(times PUBLIC ${CMAKE_CURRENT_LIST_DIR})
+target_include_directories(times PUBLIC ${CMAKE_SOURCE_DIR}/src/stellar)
+target_link_libraries(times)
+
+add_subdirectory(test)

src/times/test/CMakeLists.txt

@@ -0,0 +1,5 @@
+add_executable(gtest_times gtest_times.cpp)
+target_link_libraries(gtest_times times gtest)
+
+include(GoogleTest)
+gtest_discover_tests(gtest_times)

src/times/test/gtest_times.cpp

@@ -1,22 +1,22 @@
 #include <gtest/gtest.h>
 
-#include "timestamp.h"
+#include "times.h"
 
-TEST(TIMESTAMP, GET)
+TEST(TIMES, TEST)
 {
     uint64_t last_sec = 0;
     uint64_t last_msec = 0;
     uint64_t curr_sec = 0;
     uint64_t curr_msec = 0;
 
-    timestamp_update();
+    stellar_update_time_cache();
-    last_sec = timestamp_get_sec();
+    last_sec = stellar_get_monotonic_time_sec();
-    last_msec = timestamp_get_msec();
+    last_msec = stellar_get_monotonic_time_msec();
 
     usleep(1000); // 1ms
-    timestamp_update();
+    stellar_update_time_cache();
-    curr_sec = timestamp_get_sec();
+    curr_sec = stellar_get_monotonic_time_sec();
-    curr_msec = timestamp_get_msec();
+    curr_msec = stellar_get_monotonic_time_msec();
     printf("After usleep(1000)\n");
     printf("last_sec: %lu, last_msec: %lu\n", last_sec, last_msec);
     printf("curr_sec: %lu, curr_msec: %lu\n", curr_sec, curr_msec);
@@ -24,11 +24,11 @@ TEST(TIMESTAMP, GET)
     EXPECT_TRUE(curr_msec - last_msec >= 1);
 
     usleep(1000 * 1000); // 1s
-    timestamp_update();
+    stellar_update_time_cache();
     last_sec = curr_sec;
     last_msec = curr_msec;
-    curr_sec = timestamp_get_sec();
+    curr_sec = stellar_get_monotonic_time_sec();
-    curr_msec = timestamp_get_msec();
+    curr_msec = stellar_get_monotonic_time_msec();
     printf("After usleep(1000 * 1000)\n");
     printf("last_sec: %lu, last_msec: %lu\n", last_sec, last_msec);
     printf("curr_sec: %lu, curr_msec: %lu\n", curr_sec, curr_msec);

src/times/times.cpp

@@ -0,0 +1,85 @@
+#include <time.h>
+
+#include "macro.h"
+#include "times.h"
+
+// 1  s = 1000 ms
+// 1 ms = 1000 us
+// 1 us = 1000 ns
+
+/*
+ * The maximum number of seconds that can be stored in the time_t value is 2147483647 –- a little over 68 years.
+ *
+ * struct timespec
+ * {
+ *     time_t tv_sec; // seconds
+ *     long tv_nsec;  // nanoseconds
+ * };
+ */
+
+struct
+{
+    struct timespec real_time_spec;
+    uint64_t real_time_msec;
+    uint64_t real_time_sec;
+
+    struct timespec monotonic_time_spec;
+    uint64_t monotonic_time_msec;
+    uint64_t monotonic_time_sec;
+} global_time;
+
+void stellar_update_time_cache()
+{
+    uint64_t time_msec;
+    uint64_t time_sec;
+    /*
+     * CLOCK_MONOTONIC
+     *
+     * On Linux, that point corresponds to the number of sec‐
+     * onds that the system has been running since it was booted.
+     *
+     * The CLOCK_MONOTONIC clock is not affected by discontinuous
+     * jumps in the system time (e.g., if the system administrator
+     * manually changes the clock), but is affected by the incremen‐
+     * tal adjustments performed by adjtime(3) and NTP.
+     */
+    clock_gettime(CLOCK_MONOTONIC, &global_time.monotonic_time_spec);
+
+    time_msec = global_time.monotonic_time_spec.tv_sec * 1000 +
+                global_time.monotonic_time_spec.tv_nsec / 1000000;
+    time_sec = global_time.monotonic_time_spec.tv_sec +
+               global_time.monotonic_time_spec.tv_nsec / 1000000000;
+
+    ATOMIC_SET(&global_time.monotonic_time_msec, time_msec);
+    ATOMIC_SET(&global_time.monotonic_time_sec, time_sec);
+
+    clock_gettime(CLOCK_REALTIME, &global_time.real_time_spec);
+
+    time_msec = global_time.real_time_spec.tv_sec * 1000 +
+                global_time.real_time_spec.tv_nsec / 1000000;
+    time_sec = global_time.real_time_spec.tv_sec +
+               global_time.real_time_spec.tv_nsec / 1000000000;
+
+    ATOMIC_SET(&global_time.real_time_msec, time_msec);
+    ATOMIC_SET(&global_time.real_time_sec, time_sec);
+}
+
+uint64_t stellar_get_monotonic_time_sec()
+{
+    return ATOMIC_READ(&global_time.monotonic_time_sec);
+}
+
+uint64_t stellar_get_monotonic_time_msec()
+{
+    return ATOMIC_READ(&global_time.monotonic_time_msec);
+}
+
+uint64_t stellar_get_real_time_sec()
+{
+    return ATOMIC_READ(&global_time.real_time_sec);
+}
+
+uint64_t stellar_get_real_time_msec()
+{
+    return ATOMIC_READ(&global_time.real_time_msec);
+}

src/times/times.h

@@ -0,0 +1,23 @@
+#ifndef _TIMES_H
+#define _TIMES_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+
+void stellar_update_time_cache();
+
+uint64_t stellar_get_monotonic_time_sec();
+uint64_t stellar_get_monotonic_time_msec();
+
+uint64_t stellar_get_real_time_sec();
+uint64_t stellar_get_real_time_msec();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/timestamp/CMakeLists.txt

@@ -1,6 +0,0 @@
-add_library(timestamp timestamp.cpp)
-target_include_directories(timestamp PUBLIC ${CMAKE_CURRENT_LIST_DIR})
-target_include_directories(timestamp PUBLIC ${CMAKE_SOURCE_DIR}/src/stellar)
-target_link_libraries(timestamp)
-
-add_subdirectory(test)

src/timestamp/test/CMakeLists.txt

@@ -1,5 +0,0 @@
-add_executable(gtest_timestamp gtest_timestamp.cpp)
-target_link_libraries(gtest_timestamp timestamp gtest)
-
-include(GoogleTest)
-gtest_discover_tests(gtest_timestamp)

src/timestamp/timestamp.cpp

@@ -1,57 +0,0 @@
-#include <time.h>
-
-#include "macro.h"
-#include "timestamp.h"
-
-// 1  s = 1000 ms
-// 1 ms = 1000 us
-// 1 us = 1000 ns
-
-/*
- * The maximum number of seconds that can be stored in the time_t value is 2147483647 –- a little over 68 years.
- *
- * struct timespec
- * {
- *     time_t tv_sec; // seconds
- *     long tv_nsec;  // nanoseconds
- * };
- */
-
-struct timestamp
-{
-    struct timespec ts;
-    uint64_t ts_in_msec;
-    uint64_t ts_in_sec;
-} g_timestamp;
-
-void timestamp_update()
-{
-    /*
-     * CLOCK_MONOTONIC
-     *
-     * On Linux, that point corresponds to the number of sec‐
-     * onds that the system has been running since it was booted.
-     *
-     * The CLOCK_MONOTONIC clock is not affected by discontinuous
-     * jumps in the system time (e.g., if the system administrator
-     * manually changes the clock), but is affected by the incremen‐
-     * tal adjustments performed by adjtime(3) and NTP.
-     */
-    clock_gettime(CLOCK_MONOTONIC, &g_timestamp.ts);
-
-    uint64_t current_timestamp_ms = g_timestamp.ts.tv_sec * 1000 + g_timestamp.ts.tv_nsec / 1000000;
-    uint64_t current_timestamp_sec = g_timestamp.ts.tv_sec + g_timestamp.ts.tv_nsec / 1000000000;
-
-    ATOMIC_SET(&g_timestamp.ts_in_msec, current_timestamp_ms);
-    ATOMIC_SET(&g_timestamp.ts_in_sec, current_timestamp_sec);
-}
-
-uint64_t timestamp_get_sec()
-{
-    return ATOMIC_READ(&g_timestamp.ts_in_sec);
-}
-
-uint64_t timestamp_get_msec()
-{
-    return ATOMIC_READ(&g_timestamp.ts_in_msec);
-}

src/timestamp/timestamp.h

@@ -1,19 +0,0 @@
-#ifndef _TIMESTAMP_H
-#define _TIMESTAMP_H
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-#include <stdint.h>
-
-void timestamp_update();
-uint64_t timestamp_get_sec();
-uint64_t timestamp_get_msec();
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif

test/packet_injector.cpp

@@ -8,8 +8,8 @@
 #include <netinet/tcp.h>
 
 #include "logo.h"
+#include "times.h"
 #include "config.h"
-#include "timestamp.h"
 #include "id_generator.h"
 #include "stellar_priv.h"
 #include "session_priv.h"
@@ -377,7 +377,7 @@ int main(int argc, char **argv)
         return -1;
     }
 
-    timestamp_update();
+    stellar_update_time_cache();
 
     signal(SIGINT, signal_handler);
     signal(SIGQUIT, signal_handler);
@@ -437,13 +437,13 @@ int main(int argc, char **argv)
         goto error_out;
     }
 
-    runtime->stat_last_output_ts = timestamp_get_msec();
+    runtime->stat_last_output_ts = stellar_get_monotonic_time_msec();
     while (!ATOMIC_READ(&runtime->need_exit))
     {
-        timestamp_update();
+        stellar_update_time_cache();
-        if (timestamp_get_msec() - runtime->stat_last_output_ts > 2000)
+        if (stellar_get_monotonic_time_msec() - runtime->stat_last_output_ts > 2000)
         {
-            runtime->stat_last_output_ts = timestamp_get_msec();
+            runtime->stat_last_output_ts = stellar_get_monotonic_time_msec();
             stellar_stat_output(runtime->stat);
         }
         usleep(1000); // 1ms