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6.033 Class Notes Errata
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If you notice errors of any kind in the 6.033 class notes, ranging
from minor typos to major blunders,
please report them by e-mail to
Saltzer@mit.edu and kaashoek@mit.edu. |
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| March 20, 2005 |
Page 7-104, part 6, second paragraph: change
"sealing or unsealing" to "encrypting or decrypting" |
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| March 15, 2005 |
Chapter 7, page 118, footnote: in the URL, change NETGEAR to netgear |
| March 1,
2005 | Page 5-41. Kill the
sentence "Since the procedure... before other
threads get a chance to run" and replace it with:
When any thread waiting on eventcount next runs,
it must again test whether eventcount exceeds
value. The reason is that other, concurrent
threads may have run in the interim and
incremented value. While at the instant of the
call to NOTIFY the condition the thread was
waiting for was true, the thread must regard the
return from WAIT as merely a hint that the
condition may still be true. (The
pseudocode on 5-43 is correct, but the text here
is wrong)
Sidebar 5-3: The text should state that this code
works only for one consumer and one producer. If
there were multiple consumers p should be
protected by lock to coordinate the updates to
p. Also, it is important to note that
ADD_ITEM and REMOVE_ITEM are implemented so that
the two threads never write the same memory
location; if the text had used a linked list, then
the code should have protected the list with a
lock to coordinate multiple writers to the same
memory location. |
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| Feb 24 2005 |
Page 4-29, paragraph beginning "When the client's...":
in line 6, change "berkeley.edu" to "ucla.edu"
Page 5-37: Add the following sentence to the
end of the paragraph starting "The stack grows
toward ..": "All temporary registers are saved and
restored on the stack as part of the procedure call
conventions, and for simplicity we don't show them."
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| Feb 23 2005 |
Page 7-70, second line: "encryption" should be "cryptographic."
Page 10-24, paragraph beginning "One shortcut...":
"calculating" should be "comparing."
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| Feb 17 2005 |
5-20: the list at bottom of the page should be
in the order 3, 2, and 1.
5-25, paragraph 3:
"superviser bit" should be "user-mode bit".
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| Feb 13 2005 |
Page 4-6 and 4-11, code fragment: "restart" should be
"reset".
Page 4-7: figure 4-1, this fragment doesn't
show how the result from GET_TIME is
returned---you can assume it is in a register reserved
for return values.
Page 4-7: (The return address is 116.). 116
should be 128. Similarly, in line 112 in figure
4-1, 116 should be 128.
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| Feb 11 2005 |
Page 3-26, section 2 code: [inode] should be
[index]
Page 3-28, section 3 code: missing
BLOCK_ on the line that has return.
3-31:
"trees s" should be "trees".
3-32: In
figure 3-10, at about line 6. "Blocks #14, #94,
and #16 constitute the root directory, while block
#23..." The root inode, inode 1 (block 0)
contains "14, 37, and 16"; 94 should be
37.
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| Feb 7 2005 |
Page 3-12, sidebar 3-2: The line numbers in the
pseudocode should run from 1 to 5 rather than 10 to 14. |
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| Feb 2 2005 |
Page 1-16, last paragraph, first line: Replace "is that is that"
with "is that." |
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| Feb 1 2005 |
Page 1-6, second paragraph:
The reference to sidebar 1-1 should be to sidebar 1-3. |
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Questions or comments regarding
6.033? Send e-mail to the 6.033 staff at  or to the 6.033 TAs at 
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