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Implement a stub pthreads library for THREAD_MODEL=single #518

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merged 13 commits into from
Oct 10, 2024
+672 −47
Merged

Implement a stub pthreads library for THREAD_MODEL=single #518

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50d7d2d
Add dummy implementation of pthread_attr for single-threaded model
ArcaneNibble Sep 25, 2024
7e41cef
Add a stub implementation of barriers
ArcaneNibble Jul 16, 2024
be912c4
Add a stub implementation of mutexes
ArcaneNibble Jul 16, 2024
7d6fc8f
Add a stub implementation of condvars
ArcaneNibble Jul 18, 2024
ce2d57d
Add a stub implementation of rwlocks
ArcaneNibble Jul 18, 2024
406a6f3
Add a stub implementation of spinlocks
ArcaneNibble Jul 18, 2024
d0feeba
Enable pthread_self
ArcaneNibble Jul 17, 2024
cc0fbfe
Enable a number of functions that now work now that we have pthread_self
ArcaneNibble Jul 17, 2024
45adc9f
Don't invoke notify builtin in single-threaded mode
ArcaneNibble Aug 6, 2024
7ea3949
Add a stub for pthread_once
ArcaneNibble Sep 25, 2024
93fd9f5
Implement single_threaded pthread_exit
ArcaneNibble Jul 17, 2024
1b0706d
Add emulated thread-creation-related functions
ArcaneNibble Sep 25, 2024
9b80a8e
Make always-fail functions error if _WASI_EMULATED_PTHREAD isn't defined
ArcaneNibble Sep 25, 2024
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118 changes: 77 additions & 41 deletions Makefile
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Original file line number Diff line number Diff line change
@@ -76,6 +76,7 @@ DLMALLOC_SOURCES = $(DLMALLOC_SRC_DIR)/dlmalloc.c
DLMALLOC_INC = $(DLMALLOC_DIR)/include
EMMALLOC_DIR = emmalloc
EMMALLOC_SOURCES = $(EMMALLOC_DIR)/emmalloc.c
STUB_PTHREADS_DIR = stub-pthreads
LIBC_BOTTOM_HALF_DIR = libc-bottom-half
LIBC_BOTTOM_HALF_CLOUDLIBC_SRC = $(LIBC_BOTTOM_HALF_DIR)/cloudlibc/src
LIBC_BOTTOM_HALF_CLOUDLIBC_SRC_INC = $(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)/include
@@ -142,6 +143,8 @@ LIBWASI_EMULATED_SIGNAL_SOURCES = \
LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES = \
$(LIBC_TOP_HALF_MUSL_SRC_DIR)/signal/psignal.c \
$(LIBC_TOP_HALF_MUSL_SRC_DIR)/string/strsignal.c
LIBWASI_EMULATED_PTHREAD_SOURCES = \
$(STUB_PTHREADS_DIR)/stub-pthreads-emulated.c
LIBDL_SOURCES = $(LIBC_TOP_HALF_MUSL_SRC_DIR)/misc/dl.c
LIBSETJMP_SOURCES = $(LIBC_TOP_HALF_MUSL_SRC_DIR)/setjmp/wasm32/rt.c
LIBC_BOTTOM_HALF_CRT_SOURCES = $(wildcard $(LIBC_BOTTOM_HALF_DIR)/crt/*.c)
@@ -274,88 +277,93 @@ LIBC_TOP_HALF_MUSL_SOURCES += \
)
endif

ifeq ($(THREAD_MODEL), posix)
# pthreads functions (possibly stub) for either thread model
LIBC_TOP_HALF_MUSL_SOURCES += \
$(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
env/__init_tls.c \
stdio/__lockfile.c \
stdio/flockfile.c \
stdio/ftrylockfile.c \
stdio/funlockfile.c \
thread/__lock.c \
thread/__wait.c \
thread/__timedwait.c \
thread/default_attr.c \
thread/pthread_attr_destroy.c \
thread/pthread_attr_get.c \
thread/pthread_attr_init.c \
thread/pthread_attr_setdetachstate.c \
thread/pthread_attr_setguardsize.c \
thread/pthread_attr_setschedparam.c \
thread/pthread_attr_setstack.c \
thread/pthread_attr_setstacksize.c \
thread/pthread_attr_setschedparam.c \
thread/pthread_barrier_destroy.c \
thread/pthread_barrier_init.c \
thread/pthread_barrier_wait.c \
thread/pthread_barrierattr_destroy.c \
thread/pthread_barrierattr_init.c \
thread/pthread_barrierattr_setpshared.c \
thread/pthread_cleanup_push.c \
thread/pthread_cancel.c \
thread/pthread_cond_broadcast.c \
thread/pthread_cond_destroy.c \
thread/pthread_cond_init.c \
thread/pthread_cond_signal.c \
thread/pthread_cond_timedwait.c \
thread/pthread_cond_wait.c \
thread/pthread_cleanup_push.c \
thread/pthread_condattr_destroy.c \
thread/pthread_condattr_init.c \
thread/pthread_condattr_setclock.c \
thread/pthread_condattr_setpshared.c \
thread/pthread_create.c \
thread/pthread_detach.c \
thread/pthread_equal.c \
thread/pthread_getattr_np.c \
thread/pthread_getspecific.c \
thread/pthread_join.c \
thread/pthread_key_create.c \
thread/pthread_mutex_consistent.c \
thread/pthread_mutex_destroy.c \
thread/pthread_mutex_init.c \
thread/pthread_mutex_getprioceiling.c \
thread/pthread_mutex_lock.c \
thread/pthread_mutex_timedlock.c \
thread/pthread_mutex_trylock.c \
thread/pthread_mutex_unlock.c \
thread/pthread_mutexattr_destroy.c \
thread/pthread_mutexattr_init.c \
thread/pthread_mutexattr_setprotocol.c \
thread/pthread_mutexattr_setpshared.c \
thread/pthread_mutexattr_setrobust.c \
thread/pthread_mutexattr_settype.c \
thread/pthread_once.c \
thread/pthread_rwlock_destroy.c \
thread/pthread_rwlock_init.c \
thread/pthread_rwlock_rdlock.c \
thread/pthread_rwlock_timedrdlock.c \
thread/pthread_rwlock_timedwrlock.c \
thread/pthread_rwlock_tryrdlock.c \
thread/pthread_rwlock_trywrlock.c \
thread/pthread_rwlock_unlock.c \
thread/pthread_rwlock_wrlock.c \
thread/pthread_rwlockattr_destroy.c \
thread/pthread_rwlockattr_init.c \
thread/pthread_rwlockattr_setpshared.c \
thread/pthread_self.c \
thread/pthread_setcancelstate.c \
thread/pthread_setcanceltype.c \
thread/pthread_setspecific.c \
thread/pthread_self.c \
thread/pthread_spin_destroy.c \
thread/pthread_spin_init.c \
thread/pthread_testcancel.c \
)
ifeq ($(THREAD_MODEL), posix)
# pthreads functions needed for actual thread support
LIBC_TOP_HALF_MUSL_SOURCES += \
$(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
env/__init_tls.c \
stdio/__lockfile.c \
stdio/flockfile.c \
stdio/ftrylockfile.c \
stdio/funlockfile.c \
thread/__lock.c \
thread/__wait.c \
thread/__timedwait.c \
thread/pthread_barrier_destroy.c \
thread/pthread_barrier_init.c \
thread/pthread_barrier_wait.c \
thread/pthread_cond_broadcast.c \
thread/pthread_cond_destroy.c \
thread/pthread_cond_init.c \
thread/pthread_cond_signal.c \
thread/pthread_cond_timedwait.c \
thread/pthread_cond_wait.c \
thread/pthread_create.c \
thread/pthread_detach.c \
thread/pthread_getattr_np.c \
thread/pthread_join.c \
thread/pthread_mutex_consistent.c \
thread/pthread_mutex_getprioceiling.c \
thread/pthread_mutex_lock.c \
thread/pthread_mutex_timedlock.c \
thread/pthread_mutex_trylock.c \
thread/pthread_mutex_unlock.c \
thread/pthread_once.c \
thread/pthread_rwlock_rdlock.c \
thread/pthread_rwlock_timedrdlock.c \
thread/pthread_rwlock_timedwrlock.c \
thread/pthread_rwlock_tryrdlock.c \
thread/pthread_rwlock_trywrlock.c \
thread/pthread_rwlock_unlock.c \
thread/pthread_rwlock_wrlock.c \
thread/pthread_spin_lock.c \
thread/pthread_spin_trylock.c \
thread/pthread_spin_unlock.c \
thread/pthread_testcancel.c \
thread/sem_destroy.c \
thread/sem_getvalue.c \
thread/sem_init.c \
@@ -366,6 +374,16 @@ LIBC_TOP_HALF_MUSL_SOURCES += \
thread/wasm32/wasi_thread_start.s \
)
endif
ifeq ($(THREAD_MODEL), single)
# pthreads stubs for single-threaded environment
LIBC_TOP_HALF_MUSL_SOURCES += \
$(STUB_PTHREADS_DIR)/barrier.c \
$(STUB_PTHREADS_DIR)/condvar.c \
$(STUB_PTHREADS_DIR)/mutex.c \
$(STUB_PTHREADS_DIR)/rwlock.c \
$(STUB_PTHREADS_DIR)/spinlock.c \
$(STUB_PTHREADS_DIR)/stub-pthreads-good.c
endif

MUSL_PRINTSCAN_SOURCES = \
$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal/floatscan.c \
@@ -418,10 +436,10 @@ ifeq ($(THREAD_MODEL), posix)
# https://reviews.llvm.org/D130053).
CFLAGS += -mthread-model posix -pthread -ftls-model=local-exec
ASMFLAGS += -matomics
endif

# Include cloudlib's directory to access the structure definition of clockid_t
CFLAGS += -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)
endif

ifneq ($(LTO),no)
ifeq ($(LTO),full)
@@ -490,6 +508,7 @@ LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS = $(call objs,$(LIBWASI_EMULATED_PROCESS_CL
LIBWASI_EMULATED_GETPID_OBJS = $(call objs,$(LIBWASI_EMULATED_GETPID_SOURCES))
LIBWASI_EMULATED_SIGNAL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_SOURCES))
LIBWASI_EMULATED_SIGNAL_MUSL_OBJS = $(call objs,$(LIBWASI_EMULATED_SIGNAL_MUSL_SOURCES))
LIBWASI_EMULATED_PTHREAD_OBJS = $(call objs,$(LIBWASI_EMULATED_PTHREAD_SOURCES))
LIBDL_OBJS = $(call objs,$(LIBDL_SOURCES))
LIBSETJMP_OBJS = $(call objs,$(LIBSETJMP_SOURCES))
LIBC_BOTTOM_HALF_CRT_OBJS = $(call objs,$(LIBC_BOTTOM_HALF_CRT_SOURCES))
@@ -593,6 +612,7 @@ LIBWASI_EMULATED_PROCESS_CLOCKS_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBWASI_EMULA
LIBWASI_EMULATED_GETPID_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBWASI_EMULATED_GETPID_OBJS))
LIBWASI_EMULATED_SIGNAL_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBWASI_EMULATED_SIGNAL_OBJS))
LIBWASI_EMULATED_SIGNAL_MUSL_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS))
LIBWASI_EMULATED_PTHREAD_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBWASI_EMULATED_PTHREAD_OBJS))
LIBDL_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBDL_OBJS))
LIBSETJMP_SO_OBJS = $(patsubst %.o,%.pic.o,$(LIBSETJMP_OBJS))
BULK_MEMORY_SO_OBJS = $(patsubst %.o,%.pic.o,$(BULK_MEMORY_OBJS))
@@ -608,6 +628,7 @@ PIC_OBJS = \
$(LIBWASI_EMULATED_GETPID_SO_OBJS) \
$(LIBWASI_EMULATED_SIGNAL_SO_OBJS) \
$(LIBWASI_EMULATED_SIGNAL_MUSL_SO_OBJS) \
$(LIBWASI_EMULATED_PTHREAD_SO_OBJS) \
$(LIBDL_SO_OBJS) \
$(LIBSETJMP_SO_OBJS) \
$(BULK_MEMORY_SO_OBJS) \
@@ -649,6 +670,8 @@ $(OBJDIR)/libwasi-emulated-getpid.so.a: $(LIBWASI_EMULATED_GETPID_SO_OBJS)

$(OBJDIR)/libwasi-emulated-signal.so.a: $(LIBWASI_EMULATED_SIGNAL_SO_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_SO_OBJS)

$(OBJDIR)/libwasi-emulated-pthread.so.a: $(LIBWASI_EMULATED_PTHREAD_SO_OBJS)

$(OBJDIR)/libdl.so.a: $(LIBDL_SO_OBJS)

$(OBJDIR)/libsetjmp.so.a: $(LIBSETJMP_SO_OBJS)
@@ -667,6 +690,8 @@ $(SYSROOT_LIB)/libwasi-emulated-getpid.a: $(LIBWASI_EMULATED_GETPID_OBJS)

$(SYSROOT_LIB)/libwasi-emulated-signal.a: $(LIBWASI_EMULATED_SIGNAL_OBJS) $(LIBWASI_EMULATED_SIGNAL_MUSL_OBJS)

$(SYSROOT_LIB)/libwasi-emulated-pthread.a: $(LIBWASI_EMULATED_PTHREAD_OBJS)

$(SYSROOT_LIB)/libdl.a: $(LIBDL_OBJS)

$(SYSROOT_LIB)/libsetjmp.a: $(LIBSETJMP_OBJS)
@@ -769,6 +794,12 @@ $(FTS_OBJS): CFLAGS += \
$(LIBWASI_EMULATED_PROCESS_CLOCKS_OBJS) $(LIBWASI_EMULATED_PROCESS_CLOCKS_SO_OBJS): CFLAGS += \
-I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)

$(LIBWASI_EMULATED_PTHREAD_OBJS) $(LIBWASI_EMULATED_PTHREAD_SO_OBJS): CFLAGS += \
-I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/include \
-I$(LIBC_TOP_HALF_MUSL_SRC_DIR)/internal \
-I$(LIBC_TOP_HALF_MUSL_DIR)/arch/wasm32 \
-D_WASI_EMULATED_PTHREAD

# emmalloc uses a lot of pointer type-punning, which is UB under strict aliasing,
# and this was found to have real miscompilations in wasi-libc#421.
$(EMMALLOC_OBJS): CFLAGS += \
@@ -820,6 +851,7 @@ LIBC_SO = \
$(SYSROOT_LIB)/libwasi-emulated-process-clocks.so \
$(SYSROOT_LIB)/libwasi-emulated-getpid.so \
$(SYSROOT_LIB)/libwasi-emulated-signal.so \
$(SYSROOT_LIB)/libwasi-emulated-pthread.so \
$(SYSROOT_LIB)/libdl.so
ifeq ($(BUILD_LIBSETJMP),yes)
LIBC_SO += \
@@ -838,6 +870,10 @@ STATIC_LIBS = \
$(SYSROOT_LIB)/libwasi-emulated-getpid.a \
$(SYSROOT_LIB)/libwasi-emulated-signal.a \
$(SYSROOT_LIB)/libdl.a
ifneq ($(THREAD_MODEL), posix)
STATIC_LIBS += \
$(SYSROOT_LIB)/libwasi-emulated-pthread.a
endif
ifeq ($(BUILD_LIBSETJMP),yes)
STATIC_LIBS += \
$(SYSROOT_LIB)/libsetjmp.a
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