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We can now return to complete an investigation started in Chapter Eight concerning “aretu” and “u.u_ssav”:
After setting “u.u_ssav” (2284), “expand” calls (2285) “xswap”, which calls (4380) “swap”, which calls (5215) “sleep”, which calls (2084) “swtch”, which resets “u.u_rsav” (2189).
Thus in fact “u.u_rsav” finally gets reset to a value appropriate to four procedure calls deeper than that for “u.u_ssav”.
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