X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Ftest%2Flibcephfs%2Fflock.cc;fp=src%2Fceph%2Fsrc%2Ftest%2Flibcephfs%2Fflock.cc;h=4ee4bc0c29c63b8d73f53b036e9844841530513d;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git diff --git a/src/ceph/src/test/libcephfs/flock.cc b/src/ceph/src/test/libcephfs/flock.cc new file mode 100644 index 0000000..4ee4bc0 --- /dev/null +++ b/src/ceph/src/test/libcephfs/flock.cc @@ -0,0 +1,640 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2011 New Dream Network + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + +#include +#include "gtest/gtest.h" +#ifndef GTEST_IS_THREADSAFE +#error "!GTEST_IS_THREADSAFE" +#endif + +#include "include/cephfs/libcephfs.h" +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#ifdef __linux__ +#include +#endif + +// Startup common: create and mount ceph fs +#define STARTUP_CEPH() do { \ + ASSERT_EQ(0, ceph_create(&cmount, NULL)); \ + ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL)); \ + ASSERT_EQ(0, ceph_conf_parse_env(cmount, NULL)); \ + ASSERT_EQ(0, ceph_mount(cmount, NULL)); \ + } while(0) + +// Cleanup common: unmount and release ceph fs +#define CLEANUP_CEPH() do { \ + ASSERT_EQ(0, ceph_unmount(cmount)); \ + ASSERT_EQ(0, ceph_release(cmount)); \ + } while(0) + +static const mode_t fileMode = S_IRWXU | S_IRWXG | S_IRWXO; + +// Default wait time for normal and "slow" operations +// (5" should be enough in case of network congestion) +static const long waitMs = 10; +static const long waitSlowMs = 5000; + +// Get the absolute struct timespec reference from now + 'ms' milliseconds +static const struct timespec* abstime(struct timespec &ts, long ms) { + if (clock_gettime(CLOCK_REALTIME, &ts) == -1) { + abort(); + } + ts.tv_nsec += ms * 1000000; + ts.tv_sec += ts.tv_nsec / 1000000000; + ts.tv_nsec %= 1000000000; + return &ts; +} + +/* Basic locking */ +TEST(LibCephFS, BasicLocking) { + struct ceph_mount_info *cmount = NULL; + STARTUP_CEPH(); + + char c_file[1024]; + sprintf(c_file, "/flock_test_%d", getpid()); + const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode); + ASSERT_GE(fd, 0); + + // Lock exclusively twice + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, 42)); + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 43)); + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 44)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42)); + + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 43)); + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 44)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 43)); + + // Lock shared three times + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 42)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 43)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 44)); + // And then attempt to lock exclusively + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42)); + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 44)); + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 43)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, 45)); + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, 42)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 45)); + + // Lock shared with upgrade to exclusive (POSIX) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 42)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, 42)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42)); + + // Lock exclusive with downgrade to shared (POSIX) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, 42)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, 42)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, 42)); + + ASSERT_EQ(0, ceph_close(cmount, fd)); + ASSERT_EQ(0, ceph_unlink(cmount, c_file)); + CLEANUP_CEPH(); +} + +/* Locking in different threads */ + +// Used by ConcurrentLocking test +struct str_ConcurrentLocking { + const char *file; + struct ceph_mount_info *cmount; // !NULL if shared + sem_t sem[2]; + sem_t semReply[2]; + void sem_init(int pshared) { + ASSERT_EQ(0, ::sem_init(&sem[0], pshared, 0)); + ASSERT_EQ(0, ::sem_init(&sem[1], pshared, 0)); + ASSERT_EQ(0, ::sem_init(&semReply[0], pshared, 0)); + ASSERT_EQ(0, ::sem_init(&semReply[1], pshared, 0)); + } + void sem_destroy() { + ASSERT_EQ(0, ::sem_destroy(&sem[0])); + ASSERT_EQ(0, ::sem_destroy(&sem[1])); + ASSERT_EQ(0, ::sem_destroy(&semReply[0])); + ASSERT_EQ(0, ::sem_destroy(&semReply[1])); + } +}; + +// Wakeup main (for (N) steps) +#define PING_MAIN(n) ASSERT_EQ(0, sem_post(&s.sem[n%2])) +// Wait for main to wake us up (for (RN) steps) +#define WAIT_MAIN(n) \ + ASSERT_EQ(0, sem_timedwait(&s.semReply[n%2], abstime(ts, waitSlowMs))) + +// Wakeup worker (for (RN) steps) +#define PING_WORKER(n) ASSERT_EQ(0, sem_post(&s.semReply[n%2])) +// Wait for worker to wake us up (for (N) steps) +#define WAIT_WORKER(n) \ + ASSERT_EQ(0, sem_timedwait(&s.sem[n%2], abstime(ts, waitSlowMs))) +// Worker shall not wake us up (for (N) steps) +#define NOT_WAIT_WORKER(n) \ + ASSERT_EQ(-1, sem_timedwait(&s.sem[n%2], abstime(ts, waitMs))) + +// Do twice an operation +#define TWICE(EXPR) do { \ + EXPR; \ + EXPR; \ + } while(0) + +/* Locking in different threads */ + +// Used by ConcurrentLocking test +static void thread_ConcurrentLocking(str_ConcurrentLocking& s) { + struct ceph_mount_info *const cmount = s.cmount; + struct timespec ts; + + const int fd = ceph_open(cmount, s.file, O_RDWR | O_CREAT, fileMode); + ASSERT_GE(fd, 0); + + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, pthread_self())); + PING_MAIN(1); // (1) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, pthread_self())); + PING_MAIN(2); // (2) + + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + PING_MAIN(3); // (3) + + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, pthread_self())); + PING_MAIN(4); // (4) + + WAIT_MAIN(1); // (R1) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + PING_MAIN(5); // (5) + + WAIT_MAIN(2); // (R2) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, pthread_self())); + PING_MAIN(6); // (6) + + WAIT_MAIN(3); // (R3) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + PING_MAIN(7); // (7) +} + +// Used by ConcurrentLocking test +static void* thread_ConcurrentLocking_(void *arg) { + str_ConcurrentLocking *const s = + reinterpret_cast(arg); + thread_ConcurrentLocking(*s); + return NULL; +} + +TEST(LibCephFS, ConcurrentLocking) { + const pid_t mypid = getpid(); + struct ceph_mount_info *cmount; + STARTUP_CEPH(); + + char c_file[1024]; + sprintf(c_file, "/flock_test_%d", mypid); + const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode); + ASSERT_GE(fd, 0); + + // Lock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, pthread_self())); + + // Start locker thread + pthread_t thread; + struct timespec ts; + str_ConcurrentLocking s = { c_file, cmount }; + s.sem_init(0); + ASSERT_EQ(0, pthread_create(&thread, NULL, thread_ConcurrentLocking_, &s)); + // Synchronization point with thread (failure: thread is dead) + WAIT_WORKER(1); // (1) + + // Shall not have lock immediately + NOT_WAIT_WORKER(2); // (2) + + // Unlock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + + // Shall have lock + // Synchronization point with thread (failure: thread is dead) + WAIT_WORKER(2); // (2) + + // Synchronization point with thread (failure: thread is dead) + WAIT_WORKER(3); // (3) + + // Wait for thread to share lock + WAIT_WORKER(4); // (4) + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, pthread_self())); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, pthread_self())); + + // Wake up thread to unlock shared lock + PING_WORKER(1); // (R1) + WAIT_WORKER(5); // (5) + + // Now we can lock exclusively + // Upgrade to exclusive lock (as per POSIX) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, pthread_self())); + + // Wake up thread to lock shared lock + PING_WORKER(2); // (R2) + + // Shall not have lock immediately + NOT_WAIT_WORKER(6); // (6) + + // Release lock ; thread will get it + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + WAIT_WORKER(6); // (6) + + // We no longer have the lock + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, pthread_self())); + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, pthread_self())); + + // Wake up thread to unlock exclusive lock + PING_WORKER(3); // (R3) + WAIT_WORKER(7); // (7) + + // We can lock it again + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, pthread_self())); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + + // Cleanup + void *retval = (void*) (uintptr_t) -1; + ASSERT_EQ(0, pthread_join(thread, &retval)); + ASSERT_EQ(NULL, retval); + s.sem_destroy(); + ASSERT_EQ(0, ceph_close(cmount, fd)); + ASSERT_EQ(0, ceph_unlink(cmount, c_file)); + CLEANUP_CEPH(); +} + +TEST(LibCephFS, ThreesomeLocking) { + const pid_t mypid = getpid(); + struct ceph_mount_info *cmount; + STARTUP_CEPH(); + + char c_file[1024]; + sprintf(c_file, "/flock_test_%d", mypid); + const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode); + ASSERT_GE(fd, 0); + + // Lock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, pthread_self())); + + // Start locker thread + pthread_t thread[2]; + struct timespec ts; + str_ConcurrentLocking s = { c_file, cmount }; + s.sem_init(0); + ASSERT_EQ(0, pthread_create(&thread[0], NULL, thread_ConcurrentLocking_, &s)); + ASSERT_EQ(0, pthread_create(&thread[1], NULL, thread_ConcurrentLocking_, &s)); + // Synchronization point with thread (failure: thread is dead) + TWICE(WAIT_WORKER(1)); // (1) + + // Shall not have lock immediately + NOT_WAIT_WORKER(2); // (2) + + // Unlock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + + // Shall have lock + TWICE(// Synchronization point with thread (failure: thread is dead) + WAIT_WORKER(2); // (2) + + // Synchronization point with thread (failure: thread is dead) + WAIT_WORKER(3)); // (3) + + // Wait for thread to share lock + TWICE(WAIT_WORKER(4)); // (4) + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, pthread_self())); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, pthread_self())); + + // Wake up thread to unlock shared lock + TWICE(PING_WORKER(1); // (R1) + WAIT_WORKER(5)); // (5) + + // Now we can lock exclusively + // Upgrade to exclusive lock (as per POSIX) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, pthread_self())); + + TWICE( // Wake up thread to lock shared lock + PING_WORKER(2); // (R2) + + // Shall not have lock immediately + NOT_WAIT_WORKER(6)); // (6) + + // Release lock ; thread will get it + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + TWICE(WAIT_WORKER(6); // (6) + + // We no longer have the lock + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, pthread_self())); + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, pthread_self())); + + // Wake up thread to unlock exclusive lock + PING_WORKER(3); // (R3) + WAIT_WORKER(7); // (7) + ); + + // We can lock it again + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, pthread_self())); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, pthread_self())); + + // Cleanup + void *retval = (void*) (uintptr_t) -1; + ASSERT_EQ(0, pthread_join(thread[0], &retval)); + ASSERT_EQ(NULL, retval); + ASSERT_EQ(0, pthread_join(thread[1], &retval)); + ASSERT_EQ(NULL, retval); + s.sem_destroy(); + ASSERT_EQ(0, ceph_close(cmount, fd)); + ASSERT_EQ(0, ceph_unlink(cmount, c_file)); + CLEANUP_CEPH(); +} + +/* Locking in different processes */ + +#define PROCESS_SLOW_MS() \ + static const long waitMs = 100; \ + (void) waitMs + +// Used by ConcurrentLocking test +static void process_ConcurrentLocking(str_ConcurrentLocking& s) { + const pid_t mypid = getpid(); + PROCESS_SLOW_MS(); + + struct ceph_mount_info *cmount = NULL; + struct timespec ts; + + STARTUP_CEPH(); + s.cmount = cmount; + + const int fd = ceph_open(cmount, s.file, O_RDWR | O_CREAT, fileMode); + ASSERT_GE(fd, 0); + WAIT_MAIN(1); // (R1) + + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid)); + PING_MAIN(1); // (1) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid)); + PING_MAIN(2); // (2) + + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + PING_MAIN(3); // (3) + + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH, mypid)); + PING_MAIN(4); // (4) + + WAIT_MAIN(2); // (R2) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + PING_MAIN(5); // (5) + + WAIT_MAIN(3); // (R3) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid)); + PING_MAIN(6); // (6) + + WAIT_MAIN(4); // (R4) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + PING_MAIN(7); // (7) + + CLEANUP_CEPH(); + + s.sem_destroy(); + exit(EXIT_SUCCESS); +} + +// Disabled because of fork() issues (http://tracker.ceph.com/issues/16556) +TEST(LibCephFS, DISABLED_InterProcessLocking) { + PROCESS_SLOW_MS(); + // Process synchronization + char c_file[1024]; + const pid_t mypid = getpid(); + sprintf(c_file, "/flock_test_%d", mypid); + + // Note: the semaphores MUST be on a shared memory segment + str_ConcurrentLocking *const shs = + reinterpret_cast + (mmap(0, sizeof(*shs), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, + -1, 0)); + str_ConcurrentLocking &s = *shs; + s.file = c_file; + s.sem_init(1); + + // Start locker process + const pid_t pid = fork(); + ASSERT_GE(pid, 0); + if (pid == 0) { + process_ConcurrentLocking(s); + exit(EXIT_FAILURE); + } + + struct timespec ts; + struct ceph_mount_info *cmount; + STARTUP_CEPH(); + + const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode); + ASSERT_GE(fd, 0); + + // Lock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid)); + + // Synchronization point with process (failure: process is dead) + PING_WORKER(1); // (R1) + WAIT_WORKER(1); // (1) + + // Shall not have lock immediately + NOT_WAIT_WORKER(2); // (2) + + // Unlock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + + // Shall have lock + // Synchronization point with process (failure: process is dead) + WAIT_WORKER(2); // (2) + + // Synchronization point with process (failure: process is dead) + WAIT_WORKER(3); // (3) + + // Wait for process to share lock + WAIT_WORKER(4); // (4) + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid)); + + // Wake up process to unlock shared lock + PING_WORKER(2); // (R2) + WAIT_WORKER(5); // (5) + + // Now we can lock exclusively + // Upgrade to exclusive lock (as per POSIX) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid)); + + // Wake up process to lock shared lock + PING_WORKER(3); // (R3) + + // Shall not have lock immediately + NOT_WAIT_WORKER(6); // (6) + + // Release lock ; process will get it + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + WAIT_WORKER(6); // (6) + + // We no longer have the lock + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid)); + ASSERT_EQ(-EWOULDBLOCK, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid)); + + // Wake up process to unlock exclusive lock + PING_WORKER(4); // (R4) + WAIT_WORKER(7); // (7) + + // We can lock it again + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + + // Wait pid + int status; + ASSERT_EQ(pid, waitpid(pid, &status, 0)); + ASSERT_EQ(EXIT_SUCCESS, status); + + // Cleanup + s.sem_destroy(); + ASSERT_EQ(0, munmap(shs, sizeof(*shs))); + ASSERT_EQ(0, ceph_close(cmount, fd)); + ASSERT_EQ(0, ceph_unlink(cmount, c_file)); + CLEANUP_CEPH(); +} + +// Disabled because of fork() issues (http://tracker.ceph.com/issues/16556) +TEST(LibCephFS, DISABLED_ThreesomeInterProcessLocking) { + PROCESS_SLOW_MS(); + // Process synchronization + char c_file[1024]; + const pid_t mypid = getpid(); + sprintf(c_file, "/flock_test_%d", mypid); + + // Note: the semaphores MUST be on a shared memory segment + str_ConcurrentLocking *const shs = + reinterpret_cast + (mmap(0, sizeof(*shs), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, + -1, 0)); + str_ConcurrentLocking &s = *shs; + s.file = c_file; + s.sem_init(1); + + // Start locker processes + pid_t pid[2]; + pid[0] = fork(); + ASSERT_GE(pid[0], 0); + if (pid[0] == 0) { + process_ConcurrentLocking(s); + exit(EXIT_FAILURE); + } + pid[1] = fork(); + ASSERT_GE(pid[1], 0); + if (pid[1] == 0) { + process_ConcurrentLocking(s); + exit(EXIT_FAILURE); + } + + struct timespec ts; + struct ceph_mount_info *cmount; + STARTUP_CEPH(); + + const int fd = ceph_open(cmount, c_file, O_RDWR | O_CREAT, fileMode); + ASSERT_GE(fd, 0); + + // Lock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid)); + + // Synchronization point with process (failure: process is dead) + TWICE(PING_WORKER(1)); // (R1) + TWICE(WAIT_WORKER(1)); // (1) + + // Shall not have lock immediately + NOT_WAIT_WORKER(2); // (2) + + // Unlock + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + + // Shall have lock + TWICE(// Synchronization point with process (failure: process is dead) + WAIT_WORKER(2); // (2) + + // Synchronization point with process (failure: process is dead) + WAIT_WORKER(3)); // (3) + + // Wait for process to share lock + TWICE(WAIT_WORKER(4)); // (4) + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid)); + + // Wake up process to unlock shared lock + TWICE(PING_WORKER(2); // (R2) + WAIT_WORKER(5)); // (5) + + // Now we can lock exclusively + // Upgrade to exclusive lock (as per POSIX) + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX, mypid)); + + TWICE( // Wake up process to lock shared lock + PING_WORKER(3); // (R3) + + // Shall not have lock immediately + NOT_WAIT_WORKER(6)); // (6) + + // Release lock ; process will get it + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + TWICE(WAIT_WORKER(6); // (6) + + // We no longer have the lock + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid)); + ASSERT_EQ(-EWOULDBLOCK, + ceph_flock(cmount, fd, LOCK_SH | LOCK_NB, mypid)); + + // Wake up process to unlock exclusive lock + PING_WORKER(4); // (R4) + WAIT_WORKER(7); // (7) + ); + + // We can lock it again + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_EX | LOCK_NB, mypid)); + ASSERT_EQ(0, ceph_flock(cmount, fd, LOCK_UN, mypid)); + + // Wait pids + int status; + ASSERT_EQ(pid[0], waitpid(pid[0], &status, 0)); + ASSERT_EQ(EXIT_SUCCESS, status); + ASSERT_EQ(pid[1], waitpid(pid[1], &status, 0)); + ASSERT_EQ(EXIT_SUCCESS, status); + + // Cleanup + s.sem_destroy(); + ASSERT_EQ(0, munmap(shs, sizeof(*shs))); + ASSERT_EQ(0, ceph_close(cmount, fd)); + ASSERT_EQ(0, ceph_unlink(cmount, c_file)); + CLEANUP_CEPH(); +}