add: (linux) some performance tests for the system ipc

benchmark/benchmark_concur.cpp

@@ -10,6 +10,29 @@
 
 namespace {
 
+void concur_queue_rtt(benchmark::State &state) {
+  using namespace concur;
+  queue<std::int64_t, relation::single, relation::single> que [2];
+  std::atomic_bool stop = false;
+  auto producer = std::async(std::launch::async, [&stop, &que] {
+    for (std::int64_t i = 0; !stop.load(std::memory_order_relaxed); ++i) {
+      std::int64_t n {};
+      while (!que[0].pop(n)) ;
+      (void)que[1].push(i);
+    }
+  });
+
+  for (auto _ : state) {
+    (void)que[0].push(0);
+    std::int64_t n {};
+    while (!que[1].pop(n)) ;
+  }
+
+  stop = true;
+  (void)que[0].push(0);
+  producer.wait();
+}
+
 void concur_queue_1v1(benchmark::State &state) {
   using namespace concur;
   queue<std::int64_t, relation::single, relation::single> que;
@@ -62,5 +85,6 @@ void concur_queue_NvN(benchmark::State &state) {
 
 } // namespace
 
+BENCHMARK(concur_queue_rtt);
 BENCHMARK(concur_queue_1v1);
-BENCHMARK(concur_queue_NvN)->ThreadRange(1, 16);
+BENCHMARK(concur_queue_NvN)->ThreadRange(1, 16);

benchmark/benchmark_ipc.cpp

@@ -0,0 +1,263 @@
+
+#include <sys/eventfd.h>
+#include <sys/syscall.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+
+#include <string.h>
+#include <fcntl.h>
+#include <mqueue.h>
+
+#include <atomic>
+
+#include "benchmark/benchmark.h"
+
+#include "test_util.h"
+
+#include "libipc/shm.h"
+
+namespace {
+
+using flag_t = std::atomic_bool;
+
+struct eventfd_reader {
+  pid_t pid_ {-1};
+  int   rfd_ {eventfd(0, 0/*EFD_CLOEXEC*/)};
+  int   wfd_ {eventfd(0, 0/*EFD_CLOEXEC*/)};
+
+  eventfd_reader() {
+    auto shm = ipc::shared_memory("shm-eventfd_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(false, std::memory_order_relaxed);
+    pid_ = test::subproc([this] {
+      auto shm = ipc::shared_memory("shm-eventfd_reader", sizeof(flag_t));
+      auto flag = shm.as<flag_t>();
+      printf("eventfd_reader rfd = %d, wfd = %d\n", rfd_, wfd_);
+      while (!flag->load(std::memory_order_relaxed)) {
+        uint64_t n = 0;
+        read(wfd_, &n, sizeof(uint64_t));
+        n = 1;
+        write(rfd_, &n, sizeof(uint64_t));
+      }
+      printf("eventfd_reader exit.\n");
+    });
+  }
+
+  ~eventfd_reader() {
+    auto shm = ipc::shared_memory("shm-eventfd_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(true, std::memory_order_seq_cst);
+    uint64_t n = 1;
+    write(wfd_, &n, sizeof(uint64_t));
+    test::join_subproc(pid_);
+    close(rfd_);
+    close(wfd_);
+  }
+} evtfd_r__;
+
+struct mqueue_reader {
+  pid_t pid_ {-1};
+
+  mqueue_reader() {
+    auto shm = ipc::shared_memory("shm-mqueue_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(false, std::memory_order_relaxed);
+
+    pid_ = test::subproc([this] {
+      auto shm = ipc::shared_memory("shm-mqueue_reader", sizeof(flag_t));
+      auto flag = shm.as<flag_t>();
+      printf("mqueue_reader start.\n");
+      mqd_t wfd = mq_open("/mqueue-wfd", O_RDONLY);
+      mqd_t rfd = mq_open("/mqueue-rfd", O_WRONLY);
+      while (!flag->load(std::memory_order_relaxed)) {
+        char n {};
+        // read
+        mq_receive(wfd, &n, sizeof(n), nullptr);
+        // write
+        mq_send(rfd, &n, sizeof(n), 0);
+      }
+      printf("mqueue_reader exit.\n");
+      mq_close(wfd);
+      mq_close(rfd);
+    });
+  }
+
+  ~mqueue_reader() {
+    auto shm = ipc::shared_memory("shm-mqueue_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(true, std::memory_order_seq_cst);
+    {
+      mqd_t wfd = mq_open("/mqueue-wfd", O_WRONLY);
+      char n {};
+      mq_send(wfd, &n, sizeof(n), 0);
+      mq_close(wfd);
+    }
+    test::join_subproc(pid_);
+  }
+} mq_r__;
+
+struct sock_reader {
+  pid_t pid_ {-1};
+
+  sock_reader() {
+    auto shm = ipc::shared_memory("shm-sock_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(false, std::memory_order_relaxed);
+
+    pid_ = test::subproc([this] {
+      auto shm = ipc::shared_memory("shm-sock_reader", sizeof(flag_t));
+      auto flag = shm.as<flag_t>();
+      printf("sock_reader start.\n");
+      int lfd = socket(AF_UNIX, SOCK_STREAM, 0);
+      struct sockaddr_un serun {};
+      serun.sun_family = AF_UNIX;
+      strcpy(serun.sun_path, "shm-sock.ser");
+      unlink(serun.sun_path);
+      bind(lfd, (struct sockaddr *)&serun, offsetof(struct sockaddr_un, sun_path) + strlen(serun.sun_path));
+      listen(lfd, 16);
+      while (!flag->load(std::memory_order_relaxed)) {
+        struct sockaddr_un cliun {};
+        socklen_t cliun_len = sizeof(cliun);
+        int cfd = accept(lfd, (struct sockaddr *)&cliun, &cliun_len);
+        if (cfd < 0) {
+          printf("accept error.\n");
+          continue;
+        }
+        while (!flag->load(std::memory_order_relaxed)) {
+          char c {};
+          auto r = read(cfd, &c, sizeof(c));
+          if (r <= 0) break;
+          write(cfd, &c, sizeof(c));
+        }
+        close(cfd);
+      }
+      printf("sock_reader exit.\n");
+    });
+  }
+
+  ~sock_reader() {
+    auto shm = ipc::shared_memory("shm-sock_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(true, std::memory_order_seq_cst);
+    {
+      auto sfd = start_client();
+      char c {};
+      write(sfd, &c, sizeof(c));
+      close(sfd);
+    }
+    test::join_subproc(pid_);
+  }
+
+  int start_client() {
+    int sfd = socket(AF_UNIX, SOCK_STREAM, 0);
+    struct sockaddr_un cliun {};
+    cliun.sun_family = AF_UNIX;
+    strcpy(cliun.sun_path, "shm-sock.cli");
+    unlink(cliun.sun_path);
+    bind(sfd, (struct sockaddr *)&cliun, offsetof(struct sockaddr_un, sun_path) + strlen(cliun.sun_path));
+    struct sockaddr_un serun {};
+    serun.sun_family = AF_UNIX;
+    strcpy(serun.sun_path, "shm-sock.ser");
+    connect(sfd, (struct sockaddr *)&serun, offsetof(struct sockaddr_un, sun_path) + strlen(serun.sun_path));
+    return sfd;
+  }
+} sock_r__;
+
+struct udp_reader {
+  pid_t pid_ {-1};
+
+  udp_reader() {
+    auto shm = ipc::shared_memory("shm-udp_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(false, std::memory_order_relaxed);
+
+    pid_ = test::subproc([this] {
+      auto shm = ipc::shared_memory("shm-udp_reader", sizeof(flag_t));
+      auto flag = shm.as<flag_t>();
+      printf("udp_reader start.\n");
+      int lfd = socket(AF_INET, SOCK_DGRAM, 0);
+      struct sockaddr_in ser {};
+      ser.sin_family = AF_INET;
+      ser.sin_addr.s_addr = htonl(INADDR_ANY);
+      ser.sin_port = htons(8888);
+      bind(lfd, (struct sockaddr *)&ser, sizeof(ser));
+      while (!flag->load(std::memory_order_relaxed)) {
+        struct sockaddr_in cli {};
+        socklen_t cli_len = sizeof(cli);
+        char c {};
+        recvfrom(lfd, &c, sizeof(c), 0, (struct sockaddr *)&cli, &cli_len);
+        sendto(lfd, &c, sizeof(c), 0, (struct sockaddr *)&cli, cli_len);
+      }
+      printf("udp_reader exit.\n");
+    });
+  }
+
+  ~udp_reader() {
+    auto shm = ipc::shared_memory("shm-udp_reader", sizeof(flag_t));
+    shm.as<flag_t>()->store(true, std::memory_order_seq_cst);
+    {
+      auto sfd = socket(AF_INET, SOCK_DGRAM, 0);
+      struct sockaddr_in ser {};
+      ser.sin_family = AF_INET;
+      ser.sin_addr.s_addr = htonl(INADDR_ANY);
+      ser.sin_port = htons(8888);
+      char c {};
+      sendto(sfd, &c, sizeof(c), 0, (struct sockaddr *)&ser, sizeof(ser));
+      close(sfd);
+    }
+    test::join_subproc(pid_);
+  }
+} udp_r__;
+
+void ipc_eventfd_rtt(benchmark::State &state) {
+  for (auto _ : state) {
+    uint64_t n = 1;
+    write(evtfd_r__.wfd_, &n, sizeof(n));
+    read (evtfd_r__.rfd_, &n, sizeof(n));
+  }
+}
+
+void ipc_mqueue_rtt(benchmark::State &state) {
+  mqd_t wfd = mq_open("/mqueue-wfd", O_WRONLY);
+  mqd_t rfd = mq_open("/mqueue-rfd", O_RDONLY);
+  for (auto _ : state) {
+    char n {};
+    // write
+    mq_send(wfd, &n, sizeof(n), 0);
+    // read
+    mq_receive(rfd, &n, sizeof(n), nullptr);
+  }
+  mq_close(wfd);
+  mq_close(rfd);
+}
+
+void ipc_sock_rtt(benchmark::State &state) {
+  auto sfd = sock_r__.start_client();
+  for (auto _ : state) {
+    char n {};
+    write(sfd, &n, sizeof(n));
+    read (sfd, &n, sizeof(n));
+  }
+  close(sfd);
+}
+
+void ipc_udp_rtt(benchmark::State &state) {
+  auto sfd = socket(AF_INET, SOCK_DGRAM, 0);
+  struct sockaddr_in ser {};
+  ser.sin_family = AF_INET;
+  ser.sin_addr.s_addr = htonl(INADDR_ANY);
+  ser.sin_port = htons(8888);
+  for (auto _ : state) {
+    char n {'A'};
+    // write
+    sendto(sfd, &n, sizeof(n), 0, (struct sockaddr *)&ser, sizeof(ser));
+    // read
+    struct sockaddr_in cli {};
+    socklen_t len = sizeof(cli);
+    recvfrom(sfd, &n, sizeof(n), 0, (struct sockaddr *)&cli, &len);
+  }
+  close(sfd);
+}
+
+} // namespace
+
+BENCHMARK(ipc_eventfd_rtt);
+BENCHMARK(ipc_mqueue_rtt);
+BENCHMARK(ipc_sock_rtt);
+BENCHMARK(ipc_udp_rtt);

test/ipc/test_ipc_shm.cpp

@@ -74,4 +74,62 @@ TEST(shm, shared_memory) {
   EXPECT_EQ(*shm.as<int>(), 4444);
 
   EXPECT_TRUE(ipc::shm_close(*shm_r));
-}
+}
+
+#if 0
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <string.h>
+
+#include "test_util.h"
+
+TEST(shm, sock) {
+  auto reader = test::subproc([] {
+    int lfd = socket(AF_INET, SOCK_DGRAM, 0);
+    struct sockaddr_in ser {};
+    ser.sin_family = AF_INET;
+    ser.sin_addr.s_addr = htonl(INADDR_ANY);
+    ser.sin_port = htons(8888);
+    bind(lfd, (struct sockaddr *)&ser, sizeof(ser));
+    printf("reader prepared...\n");
+    struct sockaddr_in cli {};
+    socklen_t cli_len = sizeof(cli);
+    char c {'\0'};
+    printf("reading...\n");
+    for (;;) {
+      recvfrom(lfd, &c, sizeof(c), 0, (struct sockaddr *)&cli, &cli_len);
+      printf("read %c\n", c);
+      sendto(lfd, &c, sizeof(c), 0, (struct sockaddr *)&cli, cli_len);
+      if (c == 'Z') break;
+    }
+    close(lfd);
+  });
+
+  auto writer = test::subproc([] {
+    int sfd = socket(AF_INET, SOCK_DGRAM, 0);
+    struct sockaddr_in ser {};
+    ser.sin_family = AF_INET;
+    ser.sin_addr.s_addr = htonl(INADDR_ANY);
+    ser.sin_port = htons(8888);
+
+    printf("writer prepared...\n");
+    sleep(1);
+
+    for (char c = 'A'; c <= 'Z'; ++c) {
+      printf("write %c\n", c);
+      sendto(sfd, &c, sizeof(c), 0, (struct sockaddr *)&ser, sizeof(ser));
+      struct sockaddr_in cli {};
+      socklen_t len = sizeof(cli);
+      char n {};
+      recvfrom(sfd, &n, sizeof(n), 0, (struct sockaddr *)&cli, &len);
+      printf("echo %c\n", c);
+    }
+    close(sfd);
+  });
+
+  test::join_subproc(writer);
+  test::join_subproc(reader);
+}
+#endif

test/test_util.h

@@ -0,0 +1,34 @@
+
+#pragma once
+
+#include <sys/wait.h>
+#include <unistd.h>
+
+namespace test {
+
+template <typename Fn>
+pid_t subproc(Fn&& fn) {
+  pid_t pid = fork();
+  if (pid == -1) {
+    return pid;
+  }
+  if (!pid) {
+    // Unhook doctest from the subprocess.
+    // Otherwise, we would see a test-failure printout after the crash.
+    signal(SIGABRT, SIG_DFL);
+    signal(SIGSEGV, SIG_DFL);
+    fn();
+    exit(0);
+  }
+  return pid;
+}
+
+inline void join_subproc(pid_t pid) {
+  int ret_code;
+  waitpid(pid, &ret_code, 0);
+}
+
+} // namespace test
+
+#define REQUIRE_EXIT(...) \
+  test::join_subproc(test::subproc([&]() __VA_ARGS__))