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#ifndef RUBY_FIBER_SCHEDULER_H /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_FIBER_SCHEDULER_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @brief Scheduler APIs.
*/
#include "ruby/internal/config.h"
#include <errno.h>
#ifdef STDC_HEADERS
#include <stddef.h> /* size_t */
#endif
#include "ruby/ruby.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/arithmetic.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
struct timeval;
/**
* Wrap a `ssize_t` and `int errno` into a single `VALUE`. This interface should
* be used to safely capture results from system calls like `read` and `write`.
*
* You should use `rb_fiber_scheduler_io_result_apply` to unpack the result of
* this value and update `int errno`.
*
* You should not directly try to interpret the result value as it is considered
* an opaque representation. However, the general representation is an integer
* in the range of `[-int errno, size_t size]`. Linux generally restricts the
* result of system calls like `read` and `write` to `<= 2^31` which means this
* will typically fit within a single FIXNUM.
*
* @param[in] result The result of the system call.
* @param[in] error The value of `errno`.
* @return A `VALUE` which contains the result and/or errno.
*/
static inline VALUE
rb_fiber_scheduler_io_result(ssize_t result, int error) {
if (result == -1) {
return RB_INT2NUM(-error);
} else {
return RB_SIZE2NUM(result);
}
}
/**
* Apply an io result to the local thread, returning the value of the original
* system call that created it and updating `int errno`.
*
* You should not directly try to interpret the result value as it is considered
* an opaque representation.
*
* @param[in] result The `VALUE` which contains an errno and/or result size.
* @post Updates `int errno` with the value if negative.
* @return The original result of the system call.
*/
static inline ssize_t
rb_fiber_scheduler_io_result_apply(VALUE result) {
if (RB_FIXNUM_P(result) && RB_NUM2INT(result) < 0) {
errno = -RB_NUM2INT(result);
return -1;
} else {
return RB_NUM2SIZE(result);
}
}
/**
* Queries the current scheduler of the current thread that is calling this
* function.
*
* @retval RUBY_Qnil No scheduler has been set so far to this thread (which
* is the default).
* @retval otherwise The scheduler that was last set for the current thread
* with rb_fiber_scheduler_set().
*/
VALUE rb_fiber_scheduler_get(void);
/**
* Destructively assigns the passed scheduler to that of the current thread
* that is calling this function. If the scheduler is set, non-blocking fibers
* (created by `Fiber.new` with `blocking: false`, or by `Fiber.schedule`) call
* that scheduler's hook methods on potentially blocking operations, and the
* current thread will call scheduler's `#close` method on finalisation
* (allowing the scheduler to properly manage all non-finished fibers).
* `scheduler` can be an object of any class corresponding to
* `Fiber::SchedulerInterface`. Its implementation is up to the user.
*
* @param[in] scheduler The scheduler to set.
* @exception rb_eArgError `scheduler` does not conform the interface.
* @post Current thread's scheduler is `scheduler`.
*/
VALUE rb_fiber_scheduler_set(VALUE scheduler);
/**
* Identical to rb_fiber_scheduler_get(), except it also returns ::RUBY_Qnil in
* case of a blocking fiber. As blocking fibers do not participate schedulers'
* scheduling this function can be handy.
*
* @retval RUBY_Qnil No scheduler is in effect.
* @retval otherwise The scheduler that is in effect, if any.
*/
VALUE rb_fiber_scheduler_current(void);
/**
* Identical to rb_fiber_scheduler_current(), except it queries for that of the
* passed thread instead of the implicit current one.
*
* @param[in] thread Target thread.
* @exception rb_eTypeError `thread` is not a thread.
* @retval RUBY_Qnil No scheduler is in effect in `thread`.
* @retval otherwise The scheduler that is in effect in `thread`.
*/
VALUE rb_fiber_scheduler_current_for_thread(VALUE thread);
/**
* Converts the passed timeout to an expression that rb_fiber_scheduler_block()
* etc. expects.
*
* @param[in] timeout A duration (can be `NULL`).
* @retval RUBY_Qnil No timeout (blocks indefinitely).
* @retval otherwise A timeout object.
*/
VALUE rb_fiber_scheduler_make_timeout(struct timeval *timeout);
/**
* Closes the passed scheduler object. This expects the scheduler to wait for
* all fibers. Thus the scheduler's main loop tends to start here.
*
* @param[in] scheduler Target scheduler.
* @return What `scheduler.close` returns.
*/
VALUE rb_fiber_scheduler_close(VALUE scheduler);
/**
* Nonblocking `sleep`. Depending on scheduler implementation, this for
* instance switches to another fiber etc.
*
* @param[in] scheduler Target scheduler.
* @param[in] duration Passed as-is to `scheduler.kernel_sleep`.
* @return What `scheduler.kernel_sleep` returns.
*/
VALUE rb_fiber_scheduler_kernel_sleep(VALUE scheduler, VALUE duration);
/**
* Identical to rb_fiber_scheduler_kernel_sleep(), except it can pass multiple
* arguments.
*
* @param[in] scheduler Target scheduler.
* @param[in] argc Number of objects of `argv`.
* @param[in] argv Passed as-is to `scheduler.kernel_sleep`
* @return What `scheduler.kernel_sleep` returns.
*/
VALUE rb_fiber_scheduler_kernel_sleepv(VALUE scheduler, int argc, VALUE * argv);
/* Description TBW */
#if 0
VALUE rb_fiber_scheduler_timeout_after(VALUE scheduler, VALUE timeout, VALUE exception, VALUE message);
VALUE rb_fiber_scheduler_timeout_afterv(VALUE scheduler, int argc, VALUE * argv);
int rb_fiber_scheduler_supports_process_wait(VALUE scheduler);
#endif
/**
* Nonblocking `waitpid`. Depending on scheduler implementation, this for
* instance switches to another fiber etc.
*
* @param[in] scheduler Target scheduler.
* @param[in] pid Process ID to wait.
* @param[in] flags Wait flags, e.g. `WUNTRACED`.
* @return What `scheduler.process_wait` returns.
*/
VALUE rb_fiber_scheduler_process_wait(VALUE scheduler, rb_pid_t pid, int flags);
/**
* Nonblocking wait for the passed "blocker", which is for instance
* `Thread.join` or `Mutex.lock`. Depending on scheduler implementation, this
* for instance switches to another fiber etc.
*
* @param[in] scheduler Target scheduler.
* @param[in] blocker What blocks the current fiber.
* @param[in] timeout Numeric timeout.
* @return What `scheduler.block` returns.
*/
VALUE rb_fiber_scheduler_block(VALUE scheduler, VALUE blocker, VALUE timeout);
/**
* Wakes up a fiber previously blocked using rb_fiber_scheduler_block().
*
* @param[in] scheduler Target scheduler.
* @param[in] blocker What was awaited for.
* @param[in] fiber What to unblock.
* @return What `scheduler.unblock` returns.
*/
VALUE rb_fiber_scheduler_unblock(VALUE scheduler, VALUE blocker, VALUE fiber);
/**
* Nonblocking version of rb_io_wait(). Depending on scheduler implementation,
* this for instance switches to another fiber etc.
*
* The "events" here is a Ruby level integer, which is an OR-ed value of
* `IO::READABLE`, `IO::WRITABLE`, and `IO::PRIORITY`.
*
* @param[in] scheduler Target scheduler.
* @param[in] io An io object to wait.
* @param[in] events An integer set of interests.
* @param[in] timeout Numeric timeout.
* @return What `scheduler.io_wait` returns.
*/
VALUE rb_fiber_scheduler_io_wait(VALUE scheduler, VALUE io, VALUE events, VALUE timeout);
/**
* Nonblocking wait until the passed IO is ready for reading. This is a
* special case of rb_fiber_scheduler_io_wait(), where the interest is
* `IO::READABLE` and timeout is never.
*
* @param[in] scheduler Target scheduler.
* @param[in] io An io object to wait.
* @return What `scheduler.io_wait` returns.
*/
VALUE rb_fiber_scheduler_io_wait_readable(VALUE scheduler, VALUE io);
/**
* Nonblocking wait until the passed IO is ready for writing. This is a
* special case of rb_fiber_scheduler_io_wait(), where the interest is
* `IO::WRITABLE` and timeout is never.
*
* @param[in] scheduler Target scheduler.
* @param[in] io An io object to wait.
* @return What `scheduler.io_wait` returns.
*/
VALUE rb_fiber_scheduler_io_wait_writable(VALUE scheduler, VALUE io);
/**
* Nonblocking read from the passed IO.
*
* @param[in] scheduler Target scheduler.
* @param[out] io An io object to read from.
* @param[out] buffer Return buffer.
* @param[in] length Requested number of bytes to read.
* @retval RUBY_Qundef `scheduler` doesn't have `#io_read`.
* @return otherwise What `scheduler.io_read` returns `[-errno, size]`.
*/
VALUE rb_fiber_scheduler_io_read(VALUE scheduler, VALUE io, VALUE buffer, size_t length);
/**
* Nonblocking write to the passed IO.
*
* @param[in] scheduler Target scheduler.
* @param[out] io An io object to write to.
* @param[in] buffer What to write.
* @param[in] length Number of bytes to write.
* @retval RUBY_Qundef `scheduler` doesn't have `#io_write`.
* @return otherwise What `scheduler.io_write` returns `[-errno, size]`.
*/
VALUE rb_fiber_scheduler_io_write(VALUE scheduler, VALUE io, VALUE buffer, size_t length);
/**
* Nonblocking read from the passed IO at the specified offset.
*
* @param[in] scheduler Target scheduler.
* @param[out] io An io object to read from.
* @param[out] buffer Return buffer.
* @param[in] length Requested number of bytes to read.
* @param[in] offset The offset in the given IO to read the data from.
* @retval RUBY_Qundef `scheduler` doesn't have `#io_read`.
* @return otherwise What `scheduler.io_read` returns.
*/
VALUE rb_fiber_scheduler_io_pread(VALUE scheduler, VALUE io, VALUE buffer, size_t length, off_t offset);
/**
* Nonblocking write to the passed IO at the specified offset.
*
* @param[in] scheduler Target scheduler.
* @param[out] io An io object to write to.
* @param[in] buffer What to write.
* @param[in] length Number of bytes to write.
* @param[in] offset The offset in the given IO to write the data to.
* @retval RUBY_Qundef `scheduler` doesn't have `#io_write`.
* @return otherwise What `scheduler.io_write` returns.
*/
VALUE rb_fiber_scheduler_io_pwrite(VALUE scheduler, VALUE io, VALUE buffer, size_t length, off_t offset);
/**
* Nonblocking read from the passed IO using a native buffer.
*
* @param[in] scheduler Target scheduler.
* @param[out] io An io object to read from.
* @param[out] buffer Return buffer.
* @param[in] length Requested number of bytes to read.
* @retval RUBY_Qundef `scheduler` doesn't have `#io_read`.
* @return otherwise What `scheduler.io_read` returns.
*/
VALUE rb_fiber_scheduler_io_read_memory(VALUE scheduler, VALUE io, void *buffer, size_t size, size_t length);
/**
* Nonblocking write to the passed IO using a native buffer.
*
* @param[in] scheduler Target scheduler.
* @param[out] io An io object to write to.
* @param[in] buffer What to write.
* @param[in] length Number of bytes to write.
* @retval RUBY_Qundef `scheduler` doesn't have `#io_write`.
* @return otherwise What `scheduler.io_write` returns.
*/
VALUE rb_fiber_scheduler_io_write_memory(VALUE scheduler, VALUE io, const void *buffer, size_t size, size_t length);
/**
* Nonblocking close the given IO.
*
* @param[in] scheduler Target scheduler.
* @param[in] io An io object to close.
* @retval RUBY_Qundef `scheduler` doesn't have `#io_close`.
* @return otherwise What `scheduler.io_close` returns.
*/
VALUE rb_fiber_scheduler_io_close(VALUE scheduler, VALUE io);
/**
* Nonblocking DNS lookup.
*
* @param[in] scheduler Target scheduler.
* @param[in] hostname A host name to query.
* @retval RUBY_Qundef `scheduler` doesn't have `#address_resolve`.
* @return otherwise What `scheduler.address_resolve` returns.
*/
VALUE rb_fiber_scheduler_address_resolve(VALUE scheduler, VALUE hostname);
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RUBY_FIBER_SCHEDULER_H */