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wasi: Apply wasm_runtime_begin_blocking_op to poll as well (#3080)

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While we used a different approach for poll_oneoff [1],
the implementation works only when the poll list includes
an absolute clock event. That is, if we have a thread which is
polling on descriptors without a timeout, we fail to terminate
the thread.

This commit fixes it by applying wasm_runtime_begin_blocking_op
to poll as well.

[1] https://github.com/bytecodealliance/wasm-micro-runtime/pull/1951
This commit is contained in:
YAMAMOTO Takashi 2024-01-25 17:29:34 +09:00 committed by GitHub
parent bf9fb2e680
commit 9afbeab1c8
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GPG Key ID: B5690EEEBB952194
3 changed files with 32 additions and 6 deletions
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21
core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/blocking_op.c
View File

@ -7,6 +7,7 @@
#include "ssp_config.h"
#include "blocking_op.h"
#include "libc_errno.h"
__wasi_errno_t
blocking_op_close(wasm_exec_env_t exec_env, os_file_handle handle,
@ -170,3 +171,23 @@ blocking_op_openat(wasm_exec_env_t exec_env, os_file_handle handle,
wasm_runtime_end_blocking_op(exec_env);
return error;
}
#ifndef BH_PLATFORM_WINDOWS
/* REVISIT: apply the os_file_handle style abstraction for pollfd? */
__wasi_errno_t
blocking_op_poll(wasm_exec_env_t exec_env, struct pollfd *pfds, nfds_t nfds,
int timeout_ms, int *retp)
{
int ret;
if (!wasm_runtime_begin_blocking_op(exec_env)) {
return __WASI_EINTR;
}
ret = poll(pfds, nfds, timeout_ms);
wasm_runtime_end_blocking_op(exec_env);
if (ret == -1) {
return convert_errno(errno);
}
*retp = ret;
return 0;
}
#endif

8
core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/blocking_op.h
View File

@ -50,4 +50,10 @@ __wasi_errno_t
blocking_op_openat(wasm_exec_env_t exec_env, os_file_handle handle,
const char *path, __wasi_oflags_t oflags,
__wasi_fdflags_t fd_flags, __wasi_lookupflags_t lookup_flags,
wasi_libc_file_access_mode access_mode, os_file_handle *out);
wasi_libc_file_access_mode access_mode, os_file_handle *out);
#ifndef BH_PLATFORM_WINDOWS
__wasi_errno_t
blocking_op_poll(wasm_exec_env_t exec_env, struct pollfd *pfds, nfds_t nfds,
int timeout, int *retp);
#endif

9
core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/posix.c
View File

@ -2230,11 +2230,10 @@ wasmtime_ssp_poll_oneoff(wasm_exec_env_t exec_env, struct fd_table *curfds,
timeout = -1;
}
int ret = poll(pfds, nsubscriptions, timeout);
__wasi_errno_t error = 0;
if (ret == -1) {
error = convert_errno(errno);
int ret;
int error = blocking_op_poll(exec_env, pfds, nsubscriptions, timeout, &ret);
if (error != 0) {
/* got an error */
}
else if (ret == 0 && *nevents == 0 && clock_subscription != NULL) {
// No events triggered. Trigger the clock event.