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AK+Kernel: Handle allocation failures in Device::try_make_request
This adds try_* methods to AK::DoublyLinkedList and updates the Device class to use those to gracefully handle allocation failures. Refs #6369.
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@ -7,6 +7,7 @@
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Error.h>
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#include <AK/Find.h>
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#include <AK/StdLibExtras.h>
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@ -91,42 +92,62 @@ public:
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}
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template<typename U>
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void append(U&& value)
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ErrorOr<void> try_append(U&& value)
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{
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static_assert(
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requires { T(value); }, "Conversion operator is missing.");
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auto* node = new Node(forward<U>(value));
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auto* node = new (nothrow) Node(forward<U>(value));
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if (!node)
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return Error::from_errno(ENOMEM);
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if (!m_head) {
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VERIFY(!m_tail);
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m_head = node;
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m_tail = node;
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return;
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return {};
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}
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VERIFY(m_tail);
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VERIFY(!node->next);
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m_tail->next = node;
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node->prev = m_tail;
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m_tail = node;
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return {};
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}
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template<typename U>
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void prepend(U&& value)
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ErrorOr<void> try_prepend(U&& value)
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{
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static_assert(IsSame<T, U>);
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auto* node = new Node(forward<U>(value));
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auto* node = new (nothrow) Node(forward<U>(value));
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if (!node)
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return Error::from_errno(ENOMEM);
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if (!m_head) {
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VERIFY(!m_tail);
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m_head = node;
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m_tail = node;
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return;
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return {};
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}
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VERIFY(m_tail);
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VERIFY(!node->prev);
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m_head->prev = node;
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node->next = m_head;
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m_head = node;
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return {};
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}
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#ifndef KERNEL
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template<typename U>
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void append(U&& value)
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{
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MUST(try_append(forward<U>(value)));
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}
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template<typename U>
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void prepend(U&& value)
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{
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MUST(try_prepend(forward<U>(value)));
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}
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#endif
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[[nodiscard]] bool contains_slow(const T& value) const
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{
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return find(value) != end();
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@ -58,7 +58,7 @@ public:
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auto request = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) AsyncRequestType(*this, forward<Args>(args)...)));
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SpinlockLocker lock(m_requests_lock);
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bool was_empty = m_requests.is_empty();
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m_requests.append(request);
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TRY(m_requests.try_append(request));
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if (was_empty)
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request->do_start(move(lock));
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return request;
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