8e04fe5af3
Even though pthreads doesn't support this, there are various alternative APIs that use this. For example, uv_cond_timedwait() accepts a relative timeout. So does Rust's std::sync::Condvar::wait_timeout(). Though I personally think that relative timeouts are bad (due to imprecision for repeated operations), it does seem that people want this. Extend the existing futex functions to keep track of whether an absolute timeout is used in a boolean flag. MFC after: 1 month
88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
/*-
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* Copyright (c) 2015-2017 Nuxi, https://nuxi.nl/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CLOUDABI_UTIL_H_
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#define _CLOUDABI_UTIL_H_
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#include <sys/socket.h>
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#include <contrib/cloudabi/cloudabi_types_common.h>
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struct file;
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struct sysentvec;
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struct thread;
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struct timespec;
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/* Fetches the time value of a clock. */
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int cloudabi_clock_time_get(struct thread *, cloudabi_clockid_t,
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cloudabi_timestamp_t *);
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/* Converts a FreeBSD errno to a CloudABI errno. */
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cloudabi_errno_t cloudabi_convert_errno(int);
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/* Converts a file descriptor to a CloudABI file descriptor type. */
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cloudabi_filetype_t cloudabi_convert_filetype(const struct file *);
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/* Converts CloudABI rights to a set of Capsicum capabilities. */
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int cloudabi_convert_rights(cloudabi_rights_t, cap_rights_t *);
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/* Removes rights that conflict with the file descriptor type. */
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void cloudabi_remove_conflicting_rights(cloudabi_filetype_t,
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cloudabi_rights_t *, cloudabi_rights_t *);
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/* Converts a struct timespec to a CloudABI timestamp. */
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int cloudabi_convert_timespec(const struct timespec *, cloudabi_timestamp_t *);
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/*
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* Blocking futex functions.
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*
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* These functions are called by CloudABI's polling system calls to
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* sleep on a lock or condition variable.
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*/
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int cloudabi_futex_condvar_wait(struct thread *, cloudabi_condvar_t *,
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cloudabi_scope_t, cloudabi_lock_t *, cloudabi_scope_t, cloudabi_clockid_t,
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cloudabi_timestamp_t, cloudabi_timestamp_t, bool);
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int cloudabi_futex_lock_rdlock(struct thread *, cloudabi_lock_t *,
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cloudabi_scope_t, cloudabi_clockid_t, cloudabi_timestamp_t,
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cloudabi_timestamp_t, bool);
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int cloudabi_futex_lock_wrlock(struct thread *, cloudabi_lock_t *,
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cloudabi_scope_t, cloudabi_clockid_t, cloudabi_timestamp_t,
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cloudabi_timestamp_t, bool);
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/* Socket operations. */
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int cloudabi_sock_recv(struct thread *, cloudabi_fd_t, struct iovec *, size_t,
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cloudabi_fd_t *, size_t, cloudabi_riflags_t, size_t *, size_t *,
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cloudabi_roflags_t *);
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int cloudabi_sock_send(struct thread *, cloudabi_fd_t, struct iovec *, size_t,
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const cloudabi_fd_t *, size_t, size_t *);
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/* vDSO setup and teardown. */
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void cloudabi_vdso_init(struct sysentvec *, char *, char *);
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void cloudabi_vdso_destroy(struct sysentvec *);
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#endif
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