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https://github.com/isar/libmdbx.git
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mdbx: restore workaround for glibc's bug #21031.
Workaround for https://sourceware.org/bugzilla/show_bug.cgi?id=21031 Change-Id: I6cf9e037cc2fc298096b78ec96773f19478ed5c0
This commit is contained in:
Leo Yuriev
parent
36a86bbc6e
commit
571b50622e
10
src/bits.h
10
src/bits.h
@ -948,13 +948,13 @@ static __inline void mdbx_jitter4testing(bool tiny) {
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/* Internal prototypes and inlines */
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int mdbx_reader_check0(MDBX_env *env, int rlocked, int *dead);
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void mdbx_rthc_dtor(void *rthc);
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void mdbx_rthc_lock(void);
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void mdbx_rthc_unlock(void);
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int mdbx_rthc_alloc(mdbx_thread_key_t *key, MDBX_reader *begin,
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MDBX_reader *end);
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void mdbx_rthc_remove(mdbx_thread_key_t key);
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void mdbx_rthc_cleanup(void);
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void mdbx_rthc_remove(const mdbx_thread_key_t key);
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void mdbx_rthc_global_init(void);
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void mdbx_rthc_global_dtor(void);
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void mdbx_rthc_thread_dtor(void *ptr);
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static __inline bool mdbx_is_power2(size_t x) { return (x & (x - 1)) == 0; }
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@ -32,18 +32,12 @@
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/*----------------------------------------------------------------------------*/
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/* rthc */
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static pthread_mutex_t mdbx_rthc_mutex = PTHREAD_MUTEX_INITIALIZER;
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void mdbx_rthc_lock(void) {
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mdbx_ensure(NULL, pthread_mutex_lock(&mdbx_rthc_mutex) == 0);
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static __cold __attribute__((constructor)) void mdbx_global_constructor(void) {
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mdbx_rthc_global_init();
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}
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void mdbx_rthc_unlock(void) {
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mdbx_ensure(NULL, pthread_mutex_unlock(&mdbx_rthc_mutex) == 0);
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}
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void __attribute__((destructor)) mdbx_global_destructor(void) {
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mdbx_rthc_cleanup();
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static __cold __attribute__((destructor)) void mdbx_global_destructor(void) {
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mdbx_rthc_global_dtor();
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}
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/*----------------------------------------------------------------------------*/
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@ -27,31 +27,24 @@
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/*----------------------------------------------------------------------------*/
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/* rthc */
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static CRITICAL_SECTION rthc_critical_section;
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static void NTAPI tls_callback(PVOID module, DWORD reason, PVOID reserved) {
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(void)module;
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(void)reserved;
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switch (reason) {
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case DLL_PROCESS_ATTACH:
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InitializeCriticalSection(&rthc_critical_section);
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mdbx_rthc_global_init();
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break;
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case DLL_PROCESS_DETACH:
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DeleteCriticalSection(&rthc_critical_section);
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mdbx_rthc_global_dtor();
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break;
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case DLL_THREAD_ATTACH:
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break;
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case DLL_THREAD_DETACH:
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mdbx_rthc_cleanup();
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mdbx_rthc_thread_dtor(module);
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break;
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}
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}
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void mdbx_rthc_lock(void) { EnterCriticalSection(&rthc_critical_section); }
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void mdbx_rthc_unlock(void) { LeaveCriticalSection(&rthc_critical_section); }
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/* *INDENT-OFF* */
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/* clang-format off */
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#if defined(_MSC_VER)
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266
src/mdbx.c
266
src/mdbx.c
@ -163,43 +163,241 @@ typedef struct rthc_entry_t {
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#define RTHC_INITIAL_LIMIT 16
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#endif
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static unsigned rthc_count;
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static unsigned rthc_limit = RTHC_INITIAL_LIMIT;
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#if defined(_WIN32) || defined(_WIN64)
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static CRITICAL_SECTION rthc_critical_section;
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#else
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int __cxa_thread_atexit_impl(void (*dtor)(void *), void *obj, void *dso_symbol)
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__attribute__((weak));
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static pthread_mutex_t mdbx_rthc_mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t mdbx_rthc_cond = PTHREAD_COND_INITIALIZER;
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static mdbx_thread_key_t mdbx_rthc_key;
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static volatile uint32_t mdbx_rthc_pending;
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static void __cold mdbx_workaround_glibc_bug21031(void) {
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/* Workaround for https://sourceware.org/bugzilla/show_bug.cgi?id=21031
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*
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* Due race between pthread_key_delete() and __nptl_deallocate_tsd()
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* The destructor(s) of thread-local-storate object(s) may be running
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* in another thread(s) and be blocked or not finished yet.
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* In such case we get a SEGFAULT after unload this library DSO.
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*
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* So just by yielding a few timeslices we give a chance
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* to such destructor(s) for completion and avoids segfault. */
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sched_yield();
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sched_yield();
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sched_yield();
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}
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#endif
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static unsigned rthc_count, rthc_limit;
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static rthc_entry_t *rthc_table;
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static rthc_entry_t rthc_table_static[RTHC_INITIAL_LIMIT];
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static rthc_entry_t *rthc_table = rthc_table_static;
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__cold void mdbx_rthc_dtor(void *ptr) {
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MDBX_reader *rthc = (MDBX_reader *)ptr;
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static __cold void mdbx_rthc_lock(void) {
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#if defined(_WIN32) || defined(_WIN64)
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EnterCriticalSection(&rthc_critical_section);
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#else
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mdbx_ensure(nullptr, pthread_mutex_lock(&mdbx_rthc_mutex) == 0);
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#endif
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}
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static __cold void mdbx_rthc_unlock(void) {
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#if defined(_WIN32) || defined(_WIN64)
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LeaveCriticalSection(&rthc_critical_section);
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#else
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mdbx_ensure(nullptr, pthread_mutex_unlock(&mdbx_rthc_mutex) == 0);
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#endif
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}
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static __inline int mdbx_thread_key_create(mdbx_thread_key_t *key) {
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#if defined(_WIN32) || defined(_WIN64)
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*key = TlsAlloc();
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return (*key != TLS_OUT_OF_INDEXES) ? MDBX_SUCCESS : GetLastError();
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#else
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return pthread_key_create(key, nullptr);
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#endif
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mdbx_trace("&key = %p, value 0x%x", key, (unsigned)*key);
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}
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static __inline void mdbx_thread_key_delete(mdbx_thread_key_t key) {
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mdbx_trace("key = 0x%x", (unsigned)key);
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#if defined(_WIN32) || defined(_WIN64)
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mdbx_ensure(nullptr, TlsFree(key));
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#else
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mdbx_ensure(nullptr, pthread_key_delete(key) == 0);
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mdbx_workaround_glibc_bug21031();
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#endif
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}
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static __inline void *mdbx_thread_rthc_get(mdbx_thread_key_t key) {
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#if defined(_WIN32) || defined(_WIN64)
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return TlsGetValue(key);
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#else
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return pthread_getspecific(key);
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#endif
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}
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static void mdbx_thread_rthc_set(mdbx_thread_key_t key, const void *value) {
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#if defined(_WIN32) || defined(_WIN64)
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mdbx_ensure(nullptr, TlsSetValue(key, (void *)value));
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#else
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static __thread bool thread_registered;
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if (value && unlikely(!thread_registered)) {
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thread_registered = true;
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if (&__cxa_thread_atexit_impl == nullptr ||
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__cxa_thread_atexit_impl(mdbx_rthc_thread_dtor, &thread_registered,
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(void *)&mdbx_version /* dso_anchor */)) {
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mdbx_ensure(nullptr,
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pthread_setspecific(mdbx_rthc_key, &thread_registered) == 0);
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const unsigned count_before = mdbx_atomic_add32(&mdbx_rthc_pending, 1);
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mdbx_ensure(nullptr, count_before < INT_MAX);
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mdbx_trace("fallback to pthreads' tsd, key 0x%x, count %u",
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(unsigned)mdbx_rthc_key, count_before);
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(void)count_before;
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}
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mdbx_trace("thread registered 0x%" PRIxPTR, (uintptr_t)mdbx_thread_self());
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}
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mdbx_ensure(nullptr, pthread_setspecific(key, value) == 0);
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#endif
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}
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__cold void mdbx_rthc_global_init(void) {
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rthc_limit = RTHC_INITIAL_LIMIT;
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rthc_table = rthc_table_static;
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#if defined(_WIN32) || defined(_WIN64)
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InitializeCriticalSection(&rthc_critical_section);
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#else
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mdbx_ensure(nullptr,
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pthread_key_create(&mdbx_rthc_key, mdbx_rthc_thread_dtor) == 0);
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mdbx_trace("pid %d, &mdbx_rthc_key = %p, value 0x%x", mdbx_getpid(),
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&mdbx_rthc_key, (unsigned)mdbx_rthc_key);
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#endif
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}
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/* dtor called for thread, i.e. for all mdbx's environment objects */
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void mdbx_rthc_thread_dtor(void *ptr) {
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mdbx_rthc_lock();
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mdbx_trace(">> pid %d, thread 0x%" PRIxPTR ", rthc %p", mdbx_getpid(),
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(uintptr_t)mdbx_thread_self(), ptr);
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const mdbx_pid_t self_pid = mdbx_getpid();
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for (unsigned i = 0; i < rthc_count; ++i) {
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if (rthc >= rthc_table[i].begin && rthc < rthc_table[i].end) {
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if (rthc->mr_pid == self_pid) {
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rthc->mr_pid = 0;
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mdbx_coherent_barrier();
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}
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const mdbx_thread_key_t key = rthc_table[i].key;
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MDBX_reader *const rthc = mdbx_thread_rthc_get(key);
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if (rthc < rthc_table[i].begin || rthc >= rthc_table[i].end)
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continue;
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#if !defined(_WIN32) && !defined(_WIN64)
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if (pthread_setspecific(key, nullptr) != 0) {
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mdbx_trace("== thread 0x%" PRIxPTR
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", rthc %p: ignore race with tsd-key deletion",
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(uintptr_t)mdbx_thread_self(), ptr);
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continue /* ignore race with tsd-key deletion by mdbx_env_close() */;
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}
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#endif
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mdbx_trace("== thread 0x%" PRIxPTR
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", rthc %p, [%i], %p ... %p (%+i), rtch-pid %i, "
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"current-pid %i",
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(uintptr_t)mdbx_thread_self(), rthc, i, rthc_table[i].begin,
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rthc_table[i].end, (int)(rthc - rthc_table[i].begin),
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rthc->mr_pid, self_pid);
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if (rthc->mr_pid == self_pid) {
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mdbx_trace("==== thread 0x%" PRIxPTR ", rthc %p, cleanup",
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(uintptr_t)mdbx_thread_self(), rthc);
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rthc->mr_pid = 0;
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}
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}
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#if defined(_WIN32) || defined(_WIN64)
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mdbx_trace("<< thread 0x%" PRIxPTR ", rthc %p", (uintptr_t)mdbx_thread_self(),
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ptr);
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mdbx_rthc_unlock();
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#else
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mdbx_ensure(nullptr, mdbx_atomic_sub32(&mdbx_rthc_pending, 1) > 0);
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if (mdbx_rthc_pending == 0) {
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mdbx_trace("== thread 0x%" PRIxPTR ", rthc %p, pid %d, wake",
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(uintptr_t)mdbx_thread_self(), ptr, mdbx_getpid());
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mdbx_ensure(nullptr, pthread_cond_broadcast(&mdbx_rthc_cond) == 0);
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}
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mdbx_trace("<< thread 0x%" PRIxPTR ", rthc %p", (uintptr_t)mdbx_thread_self(),
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ptr);
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/* Allow tail call optimization, i.e. gcc should generate the jmp instruction
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* instead of a call for pthread_mutex_unlock() and therefore CPU could not
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* return to current DSO's code section, which may be unloaded immediately
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* after the mutex got released. */
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pthread_mutex_unlock(&mdbx_rthc_mutex);
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#endif
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}
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__cold void mdbx_rthc_global_dtor(void) {
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mdbx_trace(
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">> pid %d, &mdbx_rthc_global_dtor %p, &mdbx_rthc_thread_dtor = %p, "
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"&mdbx_rthc_remove = %p",
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mdbx_getpid(), &mdbx_rthc_global_dtor, &mdbx_rthc_thread_dtor,
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&mdbx_rthc_remove);
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#if defined(_WIN32) || defined(_WIN64)
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mdbx_rthc_lock();
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#else
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if (pthread_getspecific(mdbx_rthc_key) != nullptr)
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mdbx_ensure(nullptr, mdbx_atomic_sub32(&mdbx_rthc_pending, 1) > 0);
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mdbx_thread_key_delete(mdbx_rthc_key);
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mdbx_rthc_lock();
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struct timespec abstime;
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mdbx_ensure(nullptr, clock_gettime(CLOCK_REALTIME, &abstime) == 0);
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abstime.tv_nsec += 1000000000l / 10;
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if (abstime.tv_nsec >= 1000000000l) {
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abstime.tv_nsec -= 1000000000l;
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abstime.tv_sec += 1;
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}
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for (unsigned left; (left = mdbx_rthc_pending) > 0;) {
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mdbx_trace("pid %d, pending %u, wait for...", mdbx_getpid(), left);
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const int rc =
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pthread_cond_timedwait(&mdbx_rthc_cond, &mdbx_rthc_mutex, &abstime);
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if (rc && rc != EINTR) {
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/* LY: yielding a few timeslices to give a more chance
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* to racing destructor(s) for completion. */
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mdbx_workaround_glibc_bug21031();
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break;
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}
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}
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mdbx_rthc_unlock();
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}
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#endif
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__cold void mdbx_rthc_cleanup(void) {
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mdbx_rthc_lock();
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const mdbx_pid_t self_pid = mdbx_getpid();
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for (unsigned i = 0; i < rthc_count; ++i) {
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mdbx_thread_key_t key = rthc_table[i].key;
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MDBX_reader *rthc = mdbx_thread_rthc_get(key);
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if (rthc) {
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mdbx_thread_rthc_set(key, NULL);
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const mdbx_thread_key_t key = rthc_table[i].key;
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mdbx_thread_key_delete(key);
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for (MDBX_reader *rthc = rthc_table[i].begin; rthc < rthc_table[i].end;
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++rthc) {
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mdbx_trace("== [%i] = key %u, %p ... %p, rthc %p (%+i), "
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"rthc-pid %i, current-pid %i",
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i, key, rthc_table[i].begin, rthc_table[i].end, rthc,
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(int)(rthc - rthc_table[i].begin), rthc->mr_pid, self_pid);
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if (rthc->mr_pid == self_pid) {
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rthc->mr_pid = 0;
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mdbx_coherent_barrier();
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mdbx_trace("== cleanup %p", rthc);
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}
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}
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}
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rthc_limit = rthc_count = 0;
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if (rthc_table != rthc_table_static)
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free(rthc_table);
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rthc_table = nullptr;
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mdbx_rthc_unlock();
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#if defined(_WIN32) || defined(_WIN64)
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DeleteCriticalSection(&rthc_critical_section);
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#else
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/* LY: yielding a few timeslices to give a more chance
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* to racing destructor(s) for completion. */
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mdbx_workaround_glibc_bug21031();
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#endif
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mdbx_trace("<< pid %d\n", mdbx_getpid());
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}
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__cold int mdbx_rthc_alloc(mdbx_thread_key_t *key, MDBX_reader *begin,
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@ -212,11 +410,13 @@ __cold int mdbx_rthc_alloc(mdbx_thread_key_t *key, MDBX_reader *begin,
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return rc;
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mdbx_rthc_lock();
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mdbx_trace(">> key 0x%x, rthc_count %u, rthc_limit %u", *key, rthc_count,
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rthc_limit);
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if (rthc_count == rthc_limit) {
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rthc_entry_t *new_table =
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realloc((rthc_table == rthc_table_static) ? NULL : rthc_table,
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realloc((rthc_table == rthc_table_static) ? nullptr : rthc_table,
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sizeof(rthc_entry_t) * rthc_limit * 2);
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if (new_table == NULL) {
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if (new_table == nullptr) {
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rc = MDBX_ENOMEM;
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goto bailout;
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}
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@ -225,11 +425,13 @@ __cold int mdbx_rthc_alloc(mdbx_thread_key_t *key, MDBX_reader *begin,
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rthc_table = new_table;
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rthc_limit *= 2;
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}
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mdbx_trace("== [%i] = key %u, %p ... %p", rthc_count, *key, begin, end);
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rthc_table[rthc_count].key = *key;
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rthc_table[rthc_count].begin = begin;
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rthc_table[rthc_count].end = end;
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++rthc_count;
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mdbx_trace("<< key 0x%x, rthc_count %u, rthc_limit %u", *key, rthc_count,
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rthc_limit);
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mdbx_rthc_unlock();
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return MDBX_SUCCESS;
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@ -239,18 +441,25 @@ bailout:
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return rc;
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}
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__cold void mdbx_rthc_remove(mdbx_thread_key_t key) {
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mdbx_rthc_lock();
|
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__cold void mdbx_rthc_remove(const mdbx_thread_key_t key) {
|
||||
mdbx_thread_key_delete(key);
|
||||
mdbx_rthc_lock();
|
||||
mdbx_trace(">> key 0x%x, rthc_count %u, rthc_limit %u", key, rthc_count,
|
||||
rthc_limit);
|
||||
|
||||
for (unsigned i = 0; i < rthc_count; ++i) {
|
||||
if (key == rthc_table[i].key) {
|
||||
const mdbx_pid_t self_pid = mdbx_getpid();
|
||||
mdbx_trace("== [%i], %p ...%p, current-pid %d", i, rthc_table[i].begin,
|
||||
rthc_table[i].end, self_pid);
|
||||
|
||||
for (MDBX_reader *rthc = rthc_table[i].begin; rthc < rthc_table[i].end;
|
||||
++rthc)
|
||||
if (rthc->mr_pid == self_pid)
|
||||
++rthc) {
|
||||
if (rthc->mr_pid == self_pid) {
|
||||
rthc->mr_pid = 0;
|
||||
mdbx_coherent_barrier();
|
||||
mdbx_trace("== cleanup %p", rthc);
|
||||
}
|
||||
}
|
||||
if (--rthc_count > 0)
|
||||
rthc_table[i] = rthc_table[rthc_count];
|
||||
else if (rthc_table != rthc_table_static) {
|
||||
@ -262,6 +471,8 @@ __cold void mdbx_rthc_remove(mdbx_thread_key_t key) {
|
||||
}
|
||||
}
|
||||
|
||||
mdbx_trace("<< key 0x%x, rthc_count %u, rthc_limit %u", key, rthc_count,
|
||||
rthc_limit);
|
||||
mdbx_rthc_unlock();
|
||||
}
|
||||
|
||||
@ -917,6 +1128,7 @@ void __cold mdbx_debug_log(int type, const char *function, int line,
|
||||
else if (line > 0)
|
||||
fprintf(stderr, "%d: ", line);
|
||||
vfprintf(stderr, fmt, args);
|
||||
fflush(stderr);
|
||||
}
|
||||
va_end(args);
|
||||
}
|
||||
|
||||
33
src/osal.c
33
src/osal.c
@ -700,39 +700,6 @@ int mdbx_ftruncate(mdbx_filehandle_t fd, uint64_t length) {
|
||||
|
||||
/*----------------------------------------------------------------------------*/
|
||||
|
||||
int mdbx_thread_key_create(mdbx_thread_key_t *key) {
|
||||
#if defined(_WIN32) || defined(_WIN64)
|
||||
*key = TlsAlloc();
|
||||
return (*key != TLS_OUT_OF_INDEXES) ? MDBX_SUCCESS : GetLastError();
|
||||
#else
|
||||
return pthread_key_create(key, mdbx_rthc_dtor);
|
||||
#endif
|
||||
}
|
||||
|
||||
void mdbx_thread_key_delete(mdbx_thread_key_t key) {
|
||||
#if defined(_WIN32) || defined(_WIN64)
|
||||
mdbx_ensure(NULL, TlsFree(key));
|
||||
#else
|
||||
mdbx_ensure(NULL, pthread_key_delete(key) == 0);
|
||||
#endif
|
||||
}
|
||||
|
||||
void *mdbx_thread_rthc_get(mdbx_thread_key_t key) {
|
||||
#if defined(_WIN32) || defined(_WIN64)
|
||||
return TlsGetValue(key);
|
||||
#else
|
||||
return pthread_getspecific(key);
|
||||
#endif
|
||||
}
|
||||
|
||||
void mdbx_thread_rthc_set(mdbx_thread_key_t key, const void *value) {
|
||||
#if defined(_WIN32) || defined(_WIN64)
|
||||
mdbx_ensure(NULL, TlsSetValue(key, (void *)value));
|
||||
#else
|
||||
mdbx_ensure(NULL, pthread_setspecific(key, value) == 0);
|
||||
#endif
|
||||
}
|
||||
|
||||
int mdbx_thread_create(mdbx_thread_t *thread,
|
||||
THREAD_RESULT(THREAD_CALL *start_routine)(void *),
|
||||
void *arg) {
|
||||
|
||||
@ -469,10 +469,6 @@ int mdbx_thread_create(mdbx_thread_t *thread,
|
||||
THREAD_RESULT(THREAD_CALL *start_routine)(void *),
|
||||
void *arg);
|
||||
int mdbx_thread_join(mdbx_thread_t thread);
|
||||
int mdbx_thread_key_create(mdbx_thread_key_t *key);
|
||||
void mdbx_thread_key_delete(mdbx_thread_key_t key);
|
||||
void *mdbx_thread_rthc_get(mdbx_thread_key_t key);
|
||||
void mdbx_thread_rthc_set(mdbx_thread_key_t key, const void *value);
|
||||
|
||||
int mdbx_filesync(mdbx_filehandle_t fd, bool fullsync);
|
||||
int mdbx_filesize_sync(mdbx_filehandle_t fd);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user