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Guard Fiber::Scheduler support behind a property
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This commit adds the property "jruby.experimental.fiber.scheduler"
to control whether the Fiber::Scheduler subsystem will be used at
runtime. It is currently off by default, as this is an
experimental feature in all versions of Ruby that support it. Set
this property at the JVM level, or pass
-Xexperimental.fiber.scheduler to enable it.

None of the classes or constants associated with the fiber
scheduler will be defined if the property is not enabled.

In the future, this property may disappear when this feature is
finalized, or may remain under a different name to allow disabling
all scheduler checks.
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@headius
headius committed Oct 31, 2023
1 parent 2779806 commit 6b96a41
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Showing 9 changed files with 100 additions and 67 deletions.
19 changes: 13 additions & 6 deletions core/src/main/java/org/jruby/Ruby.java
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Expand Up @@ -443,7 +443,11 @@ private Ruby(RubyInstanceConfig config) {
randomClass = null;
}
ioClass = RubyIO.createIOClass(this);
ioBufferClass = RubyIOBuffer.createIOBufferClass(this);
if (Options.FIBER_SCHEDULER.load()) {
ioBufferClass = RubyIOBuffer.createIOBufferClass(this);
} else {
ioBufferClass = null;
}

structClass = profile.allowClass("Struct") ? RubyStruct.createStructClass(this) : null;
bindingClass = profile.allowClass("Binding") ? RubyBinding.createBindingClass(this) : null;
Expand Down Expand Up @@ -1718,11 +1722,14 @@ private void initExceptions() {

RubyClass runtimeError = this.runtimeError;
ObjectAllocator runtimeErrorAllocator = runtimeError.getAllocator();
bufferLockedError = ioBufferClass.defineClassUnder("LockedError", runtimeError, runtimeErrorAllocator);
bufferAllocationError = ioBufferClass.defineClassUnder("AllocationError", runtimeError, runtimeErrorAllocator);
bufferAccessError = ioBufferClass.defineClassUnder("AccessError", runtimeError, runtimeErrorAllocator);
bufferInvalidatedError = ioBufferClass.defineClassUnder("InvalidatedError", runtimeError, runtimeErrorAllocator);
bufferMaskError = ioBufferClass.defineClassUnder("MaskError", runtimeError, runtimeErrorAllocator);

if (Options.FIBER_SCHEDULER.load()) {
bufferLockedError = ioBufferClass.defineClassUnder("LockedError", runtimeError, runtimeErrorAllocator);
bufferAllocationError = ioBufferClass.defineClassUnder("AllocationError", runtimeError, runtimeErrorAllocator);
bufferAccessError = ioBufferClass.defineClassUnder("AccessError", runtimeError, runtimeErrorAllocator);
bufferInvalidatedError = ioBufferClass.defineClassUnder("InvalidatedError", runtimeError, runtimeErrorAllocator);
bufferMaskError = ioBufferClass.defineClassUnder("MaskError", runtimeError, runtimeErrorAllocator);
}

initErrno();

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11 changes: 7 additions & 4 deletions core/src/main/java/org/jruby/RubyIO.java
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Expand Up @@ -86,6 +86,7 @@
import org.jruby.runtime.encoding.EncodingService;
import org.jruby.util.ShellLauncher.POpenProcess;
import org.jruby.util.*;
import org.jruby.util.cli.Options;
import org.jruby.util.io.ChannelFD;
import org.jruby.util.io.EncodingUtils;
import org.jruby.util.io.FilenoUtil;
Expand Down Expand Up @@ -3795,10 +3796,12 @@ public static RubyIO convertToIO(ThreadContext context, IRubyObject obj) {

@JRubyMethod(name = "select", required = 1, optional = 3, checkArity = false, meta = true)
public static IRubyObject select(ThreadContext context, IRubyObject recv, IRubyObject[] argv) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioSelectv(context, scheduler, argv);
if (result != UNDEF) return result;
if (Options.FIBER_SCHEDULER.load()) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioSelectv(context, scheduler, argv);
if (result != UNDEF) return result;
}
}

int argc = Arity.checkArgumentCount(context, argv, 1, 4);
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1 change: 1 addition & 0 deletions core/src/main/java/org/jruby/RubyIOBuffer.java
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Expand Up @@ -14,6 +14,7 @@
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.ByteList;
import org.jruby.util.cli.Options;
import org.jruby.util.io.ChannelFD;
import org.jruby.util.io.OpenFile;

Expand Down
58 changes: 30 additions & 28 deletions core/src/main/java/org/jruby/ext/fiber/ThreadFiber.java
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Expand Up @@ -691,38 +691,40 @@ public IRubyObject backtrace_locations(ThreadContext context, IRubyObject level,
return threadFiber.thread.backtrace_locations(context, level, length);
}

// MRI: rb_fiber_s_schedule_kw and rb_fiber_s_schedule, kw passes on context
@JRubyMethod(name = "schedule", meta = true, rest = true, keywords = true)
public static IRubyObject schedule(ThreadContext context, IRubyObject self, IRubyObject[] args, Block block) {
RubyThread thread = context.getThread();
IRubyObject scheduler = thread.getScheduler();
IRubyObject fiber = context.nil;

if (!scheduler.isNil()) {
fiber = scheduler.callMethod(context, "fiber", args, block);
} else {
throw context.runtime.newRuntimeError("No scheduler is available!");
}
public static class FiberSchedulerSupport {
// MRI: rb_fiber_s_schedule_kw and rb_fiber_s_schedule, kw passes on context
@JRubyMethod(name = "schedule", meta = true, rest = true, keywords = true)
public static IRubyObject schedule(ThreadContext context, IRubyObject self, IRubyObject[] args, Block block) {
RubyThread thread = context.getThread();
IRubyObject scheduler = thread.getScheduler();
IRubyObject fiber = context.nil;

if (!scheduler.isNil()) {
fiber = scheduler.callMethod(context, "fiber", args, block);
} else {
throw context.runtime.newRuntimeError("No scheduler is available!");
}

return fiber;
}
return fiber;
}

// MRI: rb_fiber_s_scheduler
@JRubyMethod(name = "scheduler", meta = true)
public static IRubyObject get_scheduler(ThreadContext context, IRubyObject self) {
return context.getFiberCurrentThread().getScheduler();
}
// MRI: rb_fiber_s_scheduler
@JRubyMethod(name = "scheduler", meta = true)
public static IRubyObject get_scheduler(ThreadContext context, IRubyObject self) {
return context.getFiberCurrentThread().getScheduler();
}

// MRI: rb_fiber_current_scheduler
@JRubyMethod(name = "current_scheduler", meta = true)
public static IRubyObject current_scheduler(ThreadContext context, IRubyObject self) {
return context.getFiberCurrentThread().getSchedulerCurrent();
}
// MRI: rb_fiber_current_scheduler
@JRubyMethod(name = "current_scheduler", meta = true)
public static IRubyObject current_scheduler(ThreadContext context, IRubyObject self) {
return context.getFiberCurrentThread().getSchedulerCurrent();
}

// MRI: rb_fiber_set_scheduler
@JRubyMethod(name = "set_scheduler", meta = true)
public static IRubyObject set_scheduler(ThreadContext context, IRubyObject self, IRubyObject scheduler) {
return context.getFiberCurrentThread().setFiberScheduler(scheduler);
// MRI: rb_fiber_set_scheduler
@JRubyMethod(name = "set_scheduler", meta = true)
public static IRubyObject set_scheduler(ThreadContext context, IRubyObject self, IRubyObject scheduler) {
return context.getFiberCurrentThread().setFiberScheduler(scheduler);
}
}

public FiberData getData() {
Expand Down
6 changes: 6 additions & 0 deletions core/src/main/java/org/jruby/ext/fiber/ThreadFiberLibrary.java
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Expand Up @@ -33,6 +33,7 @@
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.load.Library;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.cli.Options;

/**
* A thread-based implementation of Ruby 1.9 Fiber library.
Expand All @@ -43,6 +44,11 @@ public RubyClass createFiberClass(final Ruby runtime) {

cFiber.defineAnnotatedMethods(ThreadFiber.class);

if (Options.FIBER_SCHEDULER.load()) {
// define additional methods for Fiber::Scheduler support
cFiber.defineAnnotatedMethods(ThreadFiber.FiberSchedulerSupport.class);
}

return cFiber;
}
}
3 changes: 2 additions & 1 deletion core/src/main/java/org/jruby/util/cli/Category.java
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Expand Up @@ -46,7 +46,8 @@ public enum Category {
JAVA_INTEGRATION("java integration"),
PROFILING("profiling"),
CLI("command line options"),
COMPLIANCE("compliance options");
COMPLIANCE("compliance options"),
EXPERIMENTAL("experimental features");

Category(String desc) {
this.desc = desc;
Expand Down
2 changes: 2 additions & 0 deletions core/src/main/java/org/jruby/util/cli/Options.java
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Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,8 @@ public class Options {

public static final Option<Integer> PROFILE_MAX_METHODS = integer(PROFILING, "profile.max.methods", 100000, "Maximum number of methods to consider for profiling.");

public static final Option<Boolean> FIBER_SCHEDULER = bool(EXPERIMENTAL, "fiber.scheduler", false, "Enable experimental Fiber::Scheduler support.");

public static final Option<Boolean> CLI_AUTOSPLIT = bool(CLI, "cli.autosplit", false, "Split $_ into $F for -p or -n. Same as -a.");
public static final Option<Boolean> CLI_DEBUG = bool(CLI, "cli.debug", false, "Enable debug mode logging. Same as -d.");
public static final Option<Boolean> CLI_PROCESS_LINE_ENDS = bool(CLI, "cli.process.line.ends", false, "Enable line ending processing. Same as -l.");
Expand Down
61 changes: 36 additions & 25 deletions core/src/main/java/org/jruby/util/io/OpenFile.java
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,6 @@
import org.jruby.Finalizable;
import org.jruby.Ruby;
import org.jruby.RubyArgsFile;
import org.jruby.RubyBasicObject;
import org.jruby.RubyBignum;
import org.jruby.RubyEncoding;
import org.jruby.RubyException;
Expand All @@ -48,6 +47,7 @@
import org.jruby.util.ByteList;
import org.jruby.util.ShellLauncher;
import org.jruby.util.StringSupport;
import org.jruby.util.cli.Options;

import static org.jruby.util.StringSupport.*;

Expand All @@ -61,6 +61,7 @@ public OpenFile(RubyIO io, IRubyObject nil) {
writeconvPreEcopts = nil;
encs.ecopts = nil;
posix = new PosixShim(runtime);
fiberScheduler = Options.FIBER_SCHEDULER.load();
}

// IO Mode flags
Expand Down Expand Up @@ -162,6 +163,8 @@ public static class Buffer {
private final Ptr spPtr = new Ptr();
private final Ptr dpPtr = new Ptr();

private final boolean fiberScheduler;

public void clearStdio() {
stdio_file = null;
}
Expand Down Expand Up @@ -462,7 +465,7 @@ public int io_fflush(ThreadContext context) {

// rb_io_wait_writable
public boolean waitWritable(ThreadContext context, long timeout) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
IRubyObject scheduler = fiberScheduler ? context.getFiberCurrentThread().getSchedulerCurrent() : null;

boolean locked = lock();
try {
Expand All @@ -477,7 +480,7 @@ public boolean waitWritable(ThreadContext context, long timeout) {
return true;
case EAGAIN:
case EWOULDBLOCK:
if (!scheduler.isNil()) {
if (fiberScheduler && !scheduler.isNil()) {
return FiberScheduler.ioWaitWritable(context, scheduler, RubyIO.newIO(context.runtime, channel())).isTrue();
}

Expand All @@ -498,7 +501,7 @@ public boolean waitWritable(ThreadContext context) {

// rb_io_wait_readable
public boolean waitReadable(ThreadContext context, long timeout) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
IRubyObject scheduler = fiberScheduler ? context.getFiberCurrentThread().getSchedulerCurrent() : null;

boolean locked = lock();
try {
Expand All @@ -513,7 +516,7 @@ public boolean waitReadable(ThreadContext context, long timeout) {
return true;
case EAGAIN:
case EWOULDBLOCK:
if (!scheduler.isNil()) {
if (fiberScheduler && !scheduler.isNil()) {
return FiberScheduler.ioWaitReadable(context, scheduler, RubyIO.newIO(context.runtime, channel())).isTrue();
}

Expand Down Expand Up @@ -1478,12 +1481,14 @@ public static int readInternal(ThreadContext context, OpenFile fptr, ChannelFD f
// rb_io_buffer_read_internal
public static int readInternal(ThreadContext context, OpenFile fptr, ChannelFD fd, ByteBuffer buffer, int buf, int count) {
// try scheduler first
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioReadMemory(context, scheduler, fptr.io, buffer, buf, count);
if (fptr.fiberScheduler) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioReadMemory(context, scheduler, fptr.io, buffer, buf, count);

if (result != null) {
return FiberScheduler.resultApply(context, result);
if (result != null) {
return FiberScheduler.resultApply(context, result);
}
}
}

Expand Down Expand Up @@ -1513,12 +1518,14 @@ simple read(2) because EINTR does not damage the descriptor.

public static int preadInternal(ThreadContext context, OpenFile fptr, ChannelFD fd, ByteBuffer buffer, int from, int length) {
// try scheduler first
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioPReadMemory(context, scheduler, fptr.io, buffer, from, length, 0);
if (fptr.fiberScheduler) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioPReadMemory(context, scheduler, fptr.io, buffer, from, length, 0);

if (result != null) {
return FiberScheduler.resultApply(context, result);
if (result != null) {
return FiberScheduler.resultApply(context, result);
}
}
}

Expand All @@ -1532,12 +1539,14 @@ public static int preadInternal(ThreadContext context, OpenFile fptr, ChannelFD

public static int pwriteInternal(ThreadContext context, OpenFile fptr, ChannelFD fd, ByteBuffer buffer, int from, int length) {
// try scheduler first
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioPWriteMemory(context, scheduler, fptr.io, buffer, from, length, 0);
if (fptr.fiberScheduler) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioPWriteMemory(context, scheduler, fptr.io, buffer, from, length, 0);

if (result != null) {
return FiberScheduler.resultApply(context, result);
if (result != null) {
return FiberScheduler.resultApply(context, result);
}
}
}

Expand Down Expand Up @@ -2479,12 +2488,14 @@ public static int writeInternal(ThreadContext context, OpenFile fptr, byte[] buf

// rb_io_buffer_write_internal
public static int writeInternal(ThreadContext context, OpenFile fptr, ByteBuffer bufBytes, int buf, int count) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioWriteMemory(context, scheduler, fptr.io, bufBytes, buf, count);
if (fptr.fiberScheduler) {
IRubyObject scheduler = context.getFiberCurrentThread().getSchedulerCurrent();
if (!scheduler.isNil()) {
IRubyObject result = FiberScheduler.ioWriteMemory(context, scheduler, fptr.io, bufBytes, buf, count);

if (result != null) {
return FiberScheduler.resultApply(context, result);
if (result != null) {
return FiberScheduler.resultApply(context, result);
}
}
}

Expand Down
6 changes: 3 additions & 3 deletions rakelib/test.rake
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Original file line number Diff line number Diff line change
Expand Up @@ -100,9 +100,9 @@ namespace :test do

mri_suites = [:core, :extra, :stdlib]
mri_suites = {
core: "-Xbacktrace.style=mri -Xdebug.fullTrace",
extra: "--disable-gems -Xbacktrace.style=mri -Xdebug.fullTrace",
stdlib: "-Xbacktrace.style=mri -Xdebug.fullTrace",
core: "-Xbacktrace.style=mri -Xdebug.fullTrace -Xexperimental.fiber.scheduler",
extra: "--disable-gems -Xbacktrace.style=mri -Xdebug.fullTrace -Xexperimental.fiber.scheduler",
stdlib: "-Xbacktrace.style=mri -Xdebug.fullTrace -Xexperimental.fiber.scheduler",
}

mri_suites.each do |suite, extra_jruby_opts|
Expand Down

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