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osthread: suspend() and resume() code deduplication #23361

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7b14dd8
osthread: gettid() alias added
denizzzka Jul 4, 2026
19c7e3e
suspendThreadImpl added, implemented for Darwin, Posix and Windows
denizzzka Jul 4, 2026
8ac650d
suspendThreadImpl used by Solaris version
denizzzka Jul 4, 2026
abf9fb1
WASI: gettid and suspendThreadImpl stubs added
denizzzka Jul 4, 2026
786e829
osthread: suspend() is unified for all OSes, loadStackAndRegInfo impl…
denizzzka Jul 4, 2026
f9c3e55
osthread: resumeThreadImpl implemented for all platforms
denizzzka Jul 4, 2026
bdb8ea3
osthread: resume() code deduplication
denizzzka Jul 4, 2026
776b6d4
wasi: suspend -> resume typo
denizzzka Jul 4, 2026
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137 changes: 61 additions & 76 deletions druntime/src/core/thread/osthread.d
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Original file line number Diff line number Diff line change
Expand Up @@ -1129,6 +1129,33 @@ private extern(D) void* getStackBottom() nothrow @nogc
static assert(false, "Platform not supported.");
}


// Returns true on success
// TODO: move to posix_impl module

@denizzzka denizzzka Jul 4, 2026

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At the moment it is difficult to do this: it clings to other symbols that have not yet been transferred to posix_impl

version (Posix)
package bool suspendThreadImpl(Thread t) @nogc nothrow
{
version (Darwin)
return thread_suspend(t.m_tmach) == KERN_SUCCESS;
else version (Solaris)
return thr_suspend(t.m_addr) == 0;
else
return pthread_kill(t.m_addr, suspendSignalNumber) == 0;
}

// Returns true on success
// TODO: move to posix_impl module
version (Posix)
package bool resumeThreadImpl(Thread t) @nogc nothrow
{
version (Darwin)
return thread_resume(t.m_tmach) == KERN_SUCCESS;
else version (Solaris)
return thr_continue(t.m_addr) == 0;
else
return pthread_kill(t.m_addr, resumeSignalNumber) == 0;
}

/**
* Suspend the specified thread and load stack and register information for
* use by thread_scanAll. If the supplied thread is the calling thread,
Expand All @@ -1153,18 +1180,31 @@ private extern (D) bool suspend( Thread t ) nothrow @nogc
return false;
}

version (Windows)
const sameThread = t.m_addr == gettid();

if (!sameThread)
{
if ( t.m_addr != GetCurrentThreadId() && SuspendThread( t.m_hndl ) == 0xFFFFFFFF )
if (!suspendThreadImpl(t))
{
if ( !t.isRunning )
if (t.isRunning)
onThreadError( "Unable to suspend thread" );
else
{
Thread.remove( t );
return false;
}
onThreadError( "Unable to suspend thread" );
}
}

loadStackAndRegInfo(t, sameThread);

return true;
}

private void loadStackAndRegInfo(Thread t, const bool sameThread) nothrow @nogc
{
version (Windows)
{
CONTEXT context = void;
context.ContextFlags = CONTEXT_INTEGER | CONTEXT_CONTROL;

Expand Down Expand Up @@ -1214,16 +1254,6 @@ private extern (D) bool suspend( Thread t ) nothrow @nogc
}
else version (Darwin)
{
if ( t.m_addr != pthread_self() && thread_suspend( t.m_tmach ) != KERN_SUCCESS )
{
if ( !t.isRunning )
{
Thread.remove( t );
return false;
}
onThreadError( "Unable to suspend thread" );
}

version (X86)
{
x86_thread_state32_t state = void;
Expand Down Expand Up @@ -1339,18 +1369,8 @@ private extern (D) bool suspend( Thread t ) nothrow @nogc
}
else version (Solaris)
{
if (t.m_addr != pthread_self())
if (!sameThread)
{
if (thr_suspend(t.m_addr) != 0)
{
if (!t.isRunning)
{
Thread.remove(t);
return false;
}
onThreadError("Unable to suspend thread");
}

static int getLwpStatus(ulong lwpid, out lwpstatus_t status)
{
import core.sys.posix.fcntl : open, O_RDONLY;
Expand Down Expand Up @@ -1476,19 +1496,7 @@ private extern (D) bool suspend( Thread t ) nothrow @nogc
}
else version (Posix)
{
if ( t.m_addr != pthread_self() )
{
if ( pthread_kill( t.m_addr, suspendSignalNumber ) != 0 )
{
if ( !t.isRunning )
{
Thread.remove( t );
return false;
}
onThreadError( "Unable to suspend thread" );
}
}
else if ( !t.m_lock )
if (sameThread && !t.m_lock)
{
t.m_curr.tstack = getStackTop();
}
Expand All @@ -1499,7 +1507,6 @@ private extern (D) bool suspend( Thread t ) nothrow @nogc
}
else
static assert(0, "unsupported os");
return true;
}

/**
Expand Down Expand Up @@ -1615,70 +1622,48 @@ extern (C) void thread_suspendAll() nothrow
private extern (D) void resume(ThreadBase _t) nothrow @nogc
{
Thread t = _t.toThread;
const sameThread = t.m_addr == gettid();

version (Windows)
if (!sameThread)
{
if ( t.m_addr != GetCurrentThreadId() && ResumeThread( t.m_hndl ) == 0xFFFFFFFF )
if (!resumeThreadImpl(t))
{
if ( !t.isRunning )
if (t.isRunning)
onThreadError( "Unable to resume thread" );
else
{
Thread.remove( t );
return;
}
onThreadError( "Unable to resume thread" );
}
}

storeStackAndRegInfo(t, sameThread);
}

private void storeStackAndRegInfo(Thread t, const bool sameThread) nothrow @nogc
{
version (Windows)
{
if ( !t.m_lock )
t.m_curr.tstack = t.m_curr.bstack;
t.m_reg[0 .. $] = 0;
}
else version (Darwin)
{
if ( t.m_addr != pthread_self() && thread_resume( t.m_tmach ) != KERN_SUCCESS )
{
if ( !t.isRunning )
{
Thread.remove( t );
return;
}
onThreadError( "Unable to resume thread" );
}

if ( !t.m_lock )
t.m_curr.tstack = t.m_curr.bstack;
t.m_reg[0 .. $] = 0;
}
else version (Solaris)
{
if (t.m_addr != pthread_self() && thr_continue(t.m_addr) != 0)
{
if (!t.isRunning)
{
Thread.remove(t);
return;
}
onThreadError("Unable to resume thread");
}

if (!t.m_lock)
t.m_curr.tstack = t.m_curr.bstack;
t.m_reg[0 .. $] = 0;
}
else version (Posix)
{
if ( t.m_addr != pthread_self() )
{
if ( pthread_kill( t.m_addr, resumeSignalNumber ) != 0 )
{
if ( !t.isRunning )
{
Thread.remove( t );
return;
}
onThreadError( "Unable to resume thread" );
}
}
else if ( !t.m_lock )
if (sameThread && !t.m_lock)
{
t.m_curr.tstack = t.m_curr.bstack;
}
Expand Down
2 changes: 2 additions & 0 deletions druntime/src/core/thread/posix_impl.d
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Original file line number Diff line number Diff line change
Expand Up @@ -584,3 +584,5 @@ class Thread : ThreadBase
sched_yield();
}
}

package alias gettid = imported!"core.sys.posix.pthread".pthread_self;
20 changes: 20 additions & 0 deletions druntime/src/core/thread/wasi_impl.d
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denizzzka marked this conversation as resolved.
Original file line number Diff line number Diff line change
Expand Up @@ -156,3 +156,23 @@ class Thread : ThreadBase
// do nothing
}
}

package ThreadID gettid() @nogc nothrow
{
onThreadError( "Unable to get WASI thread ID" );
assert(0);
}

// Returns true on success
package bool suspendThreadImpl(Thread t) @nogc nothrow
{
onThreadError( "Unable to suspend thread" );
assert(0);
}

// Returns true on success
package bool resumeThreadImpl(Thread t) @nogc nothrow
{
onThreadError( "Unable to resume thread" );
assert(0);
}
14 changes: 14 additions & 0 deletions druntime/src/core/thread/windows_impl.d
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Original file line number Diff line number Diff line change
Expand Up @@ -242,3 +242,17 @@ class Thread : ThreadBase
SwitchToThread();
}
}

package alias gettid = imported!"core.sys.windows.winbase".GetCurrentThreadId;

// Returns true on success
package bool suspendThreadImpl(Thread t) @nogc nothrow
{
return SuspendThread(t.m_hndl) != 0xFFFFFFFF;
}

// Returns true on success
package bool resumeThreadImpl(Thread t) @nogc nothrow
{
return ResumeThread(t.m_hndl) != 0xFFFFFFFF;
}
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