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Kernel: Introduce threads, and refactor everything in support of it.

Browse source 
The scheduler now operates on threads, rather than on processes.
Each process has a main thread, and can have any number of additional
threads. The process exits when the main thread exits.

This patch doesn't actually spawn any additional threads, it merely
does all the plumbing needed to make it possible. :^)
This commit is contained in:
Andreas Kling 2019-03-23 22:03:17 +01:00
parent b0de6aa8d8
commit 60d25f0f4a
32 changed files with 1356 additions and 1098 deletions
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63
Kernel/ProcFS.cpp
View file

@ -292,19 +292,24 @@ ByteBuffer procfs$pid_stack(InodeIdentifier identifier)
dword address;
const KSym* ksym;
};
Vector<RecognizedSymbol> recognized_symbols;
if (auto* eip_ksym = ksymbolicate(process.tss().eip))
recognized_symbols.append({ process.tss().eip, eip_ksym });
for (dword* stack_ptr = (dword*)process.frame_ptr(); process.validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
dword retaddr = stack_ptr[1];
if (auto* ksym = ksymbolicate(retaddr))
recognized_symbols.append({ retaddr, ksym });
}
StringBuilder builder;
for (auto& symbol : recognized_symbols) {
unsigned offset = symbol.address - symbol.ksym->address;
builder.appendf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
}
process.for_each_thread([&] (Thread& thread) {
builder.appendf("Thread %d:\n", thread.tid());
Vector<RecognizedSymbol> recognized_symbols;
if (auto* eip_ksym = ksymbolicate(thread.tss().eip))
recognized_symbols.append({ thread.tss().eip, eip_ksym });
for (dword* stack_ptr = (dword*)thread.frame_ptr(); process.validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
dword retaddr = stack_ptr[1];
if (auto* ksym = ksymbolicate(retaddr))
recognized_symbols.append({ retaddr, ksym });
}
for (auto& symbol : recognized_symbols) {
unsigned offset = symbol.address - symbol.ksym->address;
builder.appendf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
}
return IterationDecision::Continue;
});
return builder.to_byte_buffer();
}
@ -314,19 +319,23 @@ ByteBuffer procfs$pid_regs(InodeIdentifier identifier)
if (!handle)
return { };
auto& process = handle->process();
auto& tss = process.tss();
StringBuilder builder;
builder.appendf("eax: %x\n", tss.eax);
builder.appendf("ebx: %x\n", tss.ebx);
builder.appendf("ecx: %x\n", tss.ecx);
builder.appendf("edx: %x\n", tss.edx);
builder.appendf("esi: %x\n", tss.esi);
builder.appendf("edi: %x\n", tss.edi);
builder.appendf("ebp: %x\n", tss.ebp);
builder.appendf("cr3: %x\n", tss.cr3);
builder.appendf("flg: %x\n", tss.eflags);
builder.appendf("sp: %w:%x\n", tss.ss, tss.esp);
builder.appendf("pc: %w:%x\n", tss.cs, tss.eip);
process.for_each_thread([&] (Thread& thread) {
builder.appendf("Thread %d:\n", thread.tid());
auto& tss = thread.tss();
builder.appendf("eax: %x\n", tss.eax);
builder.appendf("ebx: %x\n", tss.ebx);
builder.appendf("ecx: %x\n", tss.ecx);
builder.appendf("edx: %x\n", tss.edx);
builder.appendf("esi: %x\n", tss.esi);
builder.appendf("edi: %x\n", tss.edi);
builder.appendf("ebp: %x\n", tss.ebp);
builder.appendf("cr3: %x\n", tss.cr3);
builder.appendf("flg: %x\n", tss.eflags);
builder.appendf("sp: %w:%x\n", tss.ss, tss.esp);
builder.appendf("pc: %w:%x\n", tss.cs, tss.eip);
return IterationDecision::Continue;
});
return builder.to_byte_buffer();
}
@ -530,7 +539,7 @@ ByteBuffer procfs$summary(InodeIdentifier)
process->uid(),
to_string(process->state()),
process->ppid(),
process->times_scheduled(),
process->main_thread().times_scheduled(), // FIXME(Thread): Bill all scheds to the process
process->number_of_open_file_descriptors(),
process->tty() ? strrchr(process->tty()->tty_name().characters(), '/') + 1 : "n/a",
process->name().characters());
@ -562,7 +571,7 @@ ByteBuffer procfs$all(InodeIdentifier)
auto build_process_line = [&builder] (Process* process) {
builder.appendf("%u,%u,%u,%u,%u,%u,%u,%s,%u,%u,%s,%s,%u,%u,%u,%u,%s\n",
process->pid(),
process->times_scheduled(),
process->main_thread().times_scheduled(), // FIXME(Thread): Bill all scheds to the process
process->tty() ? process->tty()->pgid() : 0,
process->pgid(),
process->sid(),
@ -576,7 +585,7 @@ ByteBuffer procfs$all(InodeIdentifier)
process->amount_virtual(),
process->amount_resident(),
process->amount_shared(),
process->ticks(),
process->main_thread().ticks(), // FIXME(Thread): Bill all ticks to the process
to_string(process->priority())
);
};